You will be given a source from the GM from where you will be able to make a character with skills and feats. For example with the D&D 3.5 system you will have to look up the Palyers handbook book 3.5 edition and follow de guidlines there to make a complete character.
Hmm... so I need to buy a player's handbook to play here? That's annoying.
Ah, well, thanks for the advice. I'll see what I can do.