1) I've a full LRC, a good bow and a maxed mule. Where i shoud go to make good money? (Skills are not capped yet).
2) How i can raise dex fast? (I know that a stat raises every 15 minutes, but i gained only 20 dex points in 11 hours of macroing with music and hiding)
I always liked fan dancer dojo. Mule will eat through fan dancer easy with bow support and they drop 600 - 700 gp. Stay in forest outside and first level to start 2nd lvl has succubus and third balron.
Dex raises pretty good with archery should go up as you hunt.
To make money, I'd suggest the beginning of the Citadel (aka Travesty's lair). The mages at the beginning are pretty easy and drop a good amount of gold.
To raise stats fast, I believe you have a higher likelihood of raising stats (still capped at 1 every 15 mins) by using skills which you have a low skill in. If you want to raise dex specifically remember to lock your other stats so you do not gain str or int. Also remember to eat, although theres debate of whether it actually helps its quite painless and cheap to keep a full stomach.
To raise dex or any stat fast use camping skill starting at 0.0 skill level. Carry about 20 kindling on you and try to make campfires. You can do that at any time so you can actually try every 15 minutes while playing. Lock your other 2 skills and dclick away till you get your gain, then go back to whatever you were doing. In the begining, you will fail almost every time so you get gains without consuming your kindling.