Lightsaber Forms
Form 1 – Shii Cho
I suggest all beginners to sword fighting learn this first. It gives you the basic methods of fighting with a Lightsaber.
Have simple duels with an opponent where you both attack and parry each others blows. Nothing to fancy, just a simple duel where one tries to stop being hit the other tries to hit the opponent. Then swap roles so that you get good at attack and defence.
Form 2 – Makashi
The ultimate refinement of lightsaber-to-lightsaber combat became Form II, advancing the precision of blade manipulation to its finest possible degree and producing the greatest dueling masters the galaxy has ever seen.
Today Form II is an archaism studied by almost no one in the Jedi Order, because it is not relevant to current tactical situations, in which Jedi enemies rarely fight with lightsabers. Even with the resurgence of the Sith, confrontation of an enemy with a lightsaber is an exceedingly rare prospect for a Jedi, so they continue to focus on more practical Forms. Sith expecting to battle lightsaber-wielding Jedi, however, find Form II a powerful technique.
Training
In a large room or garden place lots of poles between 50cm and 200cm in height around the area, spaced however you want. It is best to attach them to a round base about 30cm in diameter. Now, with your lightsaber, attempt to go around the room knocking them all down within a time limit you set yourself. Use a wide range of movements from high sweeps for the tall sticks to low sweeps for the low sticks. If you succeed try again moving the sticks to another position and make the time limit less this time until you can do it quickly.
Advanced Training
Now try this same method of training, only do it blindfolded. Use your feelings on where the sticks are and their height. Once you have mastered this try the next stage of training.
Stage 2
Now have a duel with someone. Use your feelings and use the high, low and medium attacks you know. Here you will also get better defence techniques which will improve from what you learnt in Form 1.
You can also get lessons in the Spanish form of fencing, called La Destreza Verdadera.
Form 3 – Soresu
Form III maximizes defensive protection in a style characterized by tight, efficient movements that expose minimal target area compared to the relatively open style of some of the other Forms.
Obi-Wan Kenobi takes up a dedication to Form III after the death of Qui-Gon Jinn (who favored Form IV), since it was apparent to Kenobi that Jinn's defense was insufficient against the Sith techniques of Darth Maul. True Form III masters are considered invincible. Even in his elder years, Kenobi remains a formidable Form III practitioner.
To fight this form you will need to be physically fit because it is a very long method of fighting and if you get tired first you will fall first.
Training
It is best to do lots of physical training first to build up your strength and ability to fight for long periods of time. Once you have done this fight an opponent this style and train up in defence techniques.
Form 4 – Ataru
The master practitioners of Form IV make extensive use of acrobatic maneuvers often thought not physically possible by using the Force to guide their motion. In order to master Ataru, a Jedi must be able to control his anger, because if he doesn't, his combat becomes aggressive and leads to the Dark side. Even the most skilled Jedi, such as Yoda, have difficulties controling their anger in such a situation. Ataru users have to concentrate and make their move wisely due to the terrible consequences.
Spinning, jumping and running very high and very fast, masters of Form IV are sometimes only seen as a blur. In order to achieve the acrobatic prowess, amazing reflexes and physical punch of this form, a Jedi Master would focus on the Force, letting it flow deeply throughout his entire physicality, even allowing him to overcome the limitations of old age. Due to its aggressive nature, it is an effective form to use against single enemies; however, it leaves the user open to attacks from multiple opponents; therefore, it is wise to use Ataru in a duel, but not in open warfare.
Make sure you get professional trainign for doing such acrobatic moves.
(Watch Yoda fighting for moves in Ataru.)
Form 5 – Djem So
During an era when Jedi were called upon to more actively maintain the peace in the galaxy, Form V arose alongside Form IV to address a need for greater power among the Jedi. Jedi Masters who felt that Form III could be too passive developed Form V. A Form III master might be undefeatable, but neither could he necessarily overcome his enemy. Form V focuses on strength and lightsaber attack moves. This Form exploits the ability of the lightsaber to block a blaster bolt and turns this defensive move into an offensive attack by deflecting the bolt deliberately towards an opponent. A dedication to the power and strength necessary to defeat an enemy characterizes the philosophy of Form V, which some Jedi describe by the maxim "peace through superior firepower." To some Jedi Knights, Form V represents a worthy discipline prepared for any threat; to others Form V seems to foster an inappropriate focus on dominating others.
If you learn Form 5 it is also a useful idea to learn Form 3 as well.
Form 6 – Nimen
This Form balances the emphases of other Forms with overall moderation, in keeping with the Jedi quest to achieve true harmony and justice without resorting to the rule of power. It is considered the "diplomat's Form" because it is less intensive in its demands than the other disciplines, allowing Jedi to spend more time developing their skills in perception, political strategy, and negotiation. In practice, Form VI is a combination of Forms I, III, IV, and V. Young Jedi spend their first few years studying Form I and then a year or two with each additional Form before completing their training. By comparison, a Form VI master will spend at least ten years studying only that Form after completing the basic Form I training. Form VI well suits the modern Jedi's role in the galaxy, in which a Knight overly trained in martial combat might be at a loss to resolve a complex political conflict between star systems. However, full masters of other Forms sometimes consider Form VI to be insufficiently demanding.
Form 7 - Juyo
Only high-level masters of multiple Forms can achieve and control the ultimate descipline known as Form VII. This is the most difficult and demanding of all Forms, but it can eventually lead to fantastic power and skill. Form VII employs bold, direct movements, more open and kinetic than Form V but not so elaborate in appearance as Form IV. In addition to very advanced Force-assisted jumps and movements, Form VII tactics overwhelm opponents with seemingly unconnected staccato sequences, making the Form highly unpredictable in battle. This trait makes for a much more difficult execution than the graceful, linked move sequences of Form IV. Form VII requires the intensity of Form V, but much greater energy since that focus is wielded more broadly. Form VII draws upon a deeper well of emotion than even Form V, yet masters it more fully. The outward bearing of a Form VII practitioner is one of calm, but the inner pressure verges on explosion. Form VII is still under development since so few can achieve the necessary mastery to advance the art.
Unofficial Forms
The unofficial forms can be chosen once you have reached the rank of Knight or if you are a Council Member.
Form 8 - Sokan
Sokan uses fast moves against the opponent, targeting the arms and legs in order to defeat their opponent. Terrain is also used to help defeat the enemy, such as using higher ground to offer an advantageous position.
Form 9 - Shien
Shien uniquely involves a Jedi holding the lightsaber horizontally. The Jedi pointed the end of the blade at the opponent; it was swung in a fast arc while the Jedi punched his or her saber-hand at his or her opposing combatant, in a stabbing motion.
Form 10 - Jar'Kai
This Form uses two lightsabers in combat, one in each hand. One lightsaber is usually used for attack and the other for defence
Unorthodox Styles
There are also unorthodox styles of fighting, such as using a double bladed lightsaber or holding the lightsaber so that the blade points behind you instead of infront.