I don't even know how many servers there are anymore xD I know theres Teva, Epith, Bijou, Legal, one other one that pretty much no one goes on... and maybe another one, not sure. I do know that Teva is the oldest and most crowded... at least when I played it was.
Be warned, you practically NEED cash shop at high levels... and welcome =]
If you need more info you can always go to our
wiki. That should help with class and quest questions.