Hi o:
You can join a game when it's in the sign-up phase (green prefix tag)! Unfortunately this doesn't always last very long, like a couple of days or something.
We're actually in the midst of planning a beginners game! So that sounds like something useful to you :) it'll be a simplified game where myself and Ash help people get to grips with how the game works.
You could check out Davepetasprite^2's little tutorial in the mean time. Hopefully that gives you some idea of what to expect! :)
http://www.pokecommunity.com/showthread.php?t=348448