2.) Don't troll the articles. It's going to be hard enough to maintain this wiki without having to clean up "graffiti".
3.) When you edit the articles, try to be serious. Don't be boring, but don't edit strictly for the lulz, either.
4.) Try to be as neutral as possible when creating user articles. This rule, of course, can be bent to some degree when creating articles for known trolls.
5.) Don't use vulgar language or post inappropriate pictures. Basically, anything acceptable by IGN's Terms of Service is okay here.