Please, please, please don't make it like the Gleemax one. Of course, that open free-form (basically) format is fine (unless they have since made it much less free-form; I wouldn't know, having become fed up with it in December), but if it is anything like how that turned out, there's no way I'm down.
Seriously, that had major issues (mostly caused by a few people - some just repeat god-mode offenders, others thought they themselves could simply assume complete control of the role-play by making absurd rules and inflating the game's "economy" with free money to people they liked).
I was with that when it started back in May of last year up until December (as a "Gleemaxian Council Member," a co-maintainer of the Gleemax Wiki before ZsasZ shut it down, and the Flame Wars organizer for a time (shortly before I left because I couldn't take the fact that everyone who agreed that there were major problems was pussy-footing around them rather than confronting them, making it impossible to actually change anything that needed changing), and then co-admin for ZsasZ's forum for the few weeks it existed before he shut that down as well...
Anyway, if you need help, I'll help, but you definitely want to avoid a lot of what happened with the Gleemax Role-Play.