easy, build around your favorite pokemon. winning is meaningless when you're using a bunch of OU's with movesets that ppl made up which are practically set in stone. just pick your favorite pokemon, get some experience, and you'll eventually pick up a couple strategies. when you get good you can start to create your own strategies and movesets, it all starts with experience.
i was a big pokemon anime fan, and a huge fan of the kanto starters, so i just tried building around them. people call me noob and stuff, and that kanto starters are overshadowed by other OU's but i didn't care. now i've created a practically invincible ash team with pikachu, venasaur, charizard, blastoise, heracross, and snorlax. also just come visit the forum lots and ask for help. there are some excellent net battlers here who are willing to help you with your team.