Head over to the Forum pages and find a news section with guides on all the classes. At the moment it only has Burglar guides (with Minstrel and Guardian on the way).
As well as having information on how to play AS each class there is also information on how to play WITH each class, I would encourage everyone to read this bit at least, should be interesting.
If anybody would like to volunteer to write Loremaster, Champion, Hunter or Captain guides that would be most appreciated (don't feel you have to write as much as I did, I got bored at work and it was more interesting to fill the guide up). Send me a PM if you will help us out :)