Hello! Always great to see new people joining and you seem to be especially awesome, so I'll even write you a welcoming post! Hooray!
Anyhow, everything to be said about forum RPs in here has already been said. There's not many of them (yet) and we're still working on that. I'd love to join the kind of RP you seem to have in mind, though, I've been in a few of RPs like that before (although fairly briefly) and I enjoyed it a lot. So if you'll create a thread, I'll likely sign up.
Note about the location of the potential thread, though: we're still organizing and everything (there's a big community overhaul going on) and while the roleplays were situated in the Off-Topic section yesterday, today they seem to have moved location to Forum Games, so until further notice, it'd probably be best to do it there, if you do it at all (which I hope you do).