Hey oris,
I'll let somebody else answer your AI question, because I don't know the answer. But I would say that you should go ahead and join a game here if you're pretty clear on the rules. You say you don't want to have to drop out -- well, definitely don't drop out. That is the only thing that would offend people. As long as you stay in the game and keep playing, making mistakes is forgiveable, and you'll pick up pretty fast after a game or two.
Believe me, you won't be the worst player on the site. Go ahead and play and don't stress out too much.
It's cool that you're concerned about not ruining the game for other players though. Just don't NMR, and reason through your moves as well as you can, and you should be fine.
Once you get going, know which country you are, etc., maybe you'd find it helpful to check out some of the articles here:
http://www.diplom.org/~diparch/resources/strategy.htm
Good luck!