ShinyVincent, hehe :3 First off the rules are a lot different, I suggest going onto the official Pokémon site or bulba, for the VGC rules, I think I made a thread on here somewhere as well.
Also everything is 4v4 doubles with 2 "back up" Pokémon. You bring 6 but only 4 see battle each round. So the first 2 things you should do is read the rules for VGC over a couple times then think of a team within the Kalos dex you might want to play. Nugget bridge is a good site to look at different teams topping around the world.