It all depends on what aspects of the fandom you like. I can't really decide whether you like Pikachu or Gastly, or Fire types or Water types. It's up to you to find the clubs you're interested in, and considering if you want to join them ^^
As for the background, you have to be at least a tier 1 supporter or a staff member to be able to use pictures as your background. So if you want to have a background like mine, you'll either have to donate, or somehow find a way to become a mod.
I have no idea where you got the impression that I was addicted to cocaine from, however I can assure you I'd never do drugs :S