I'd say don't start to many rp's. But you can use this discussion thread to have folks ask questions and get info and ideas so when you do finish 1 or more current rp's (only you know how many you can easilily handle running) then you can start this one.
For some other folks that are interested, no idea if I'll be or not, but I do, if I notice, try to ask some questions for other folks & give them some info to start on so they can more quickly come up with char ideas to post in the discussion area or pm the gm about. .
Any char types you'd like to have certain areas covered, any types you don't want? allowed races? any magic, super powers, super martial arts? Tech level, types of weapons and armor allowed.