Best method of identifying users from the db?

[Sykoi]

Well basically I want to give my users the ability to create a "family forum" (Think a clan area), and have control over it... Now I want to control WHEN they're able to do it, like reaching a certain activity level...
They'd be able to password it, unpassword it... And of course moderate it and all that basic stuff (But moderation from the forum, not the site)

I just realized... I could just make a dummy forum thats invisible, then get that ID from the db and modify whatever I need, and re-insert it... However, are there any other tables I need to add data to in order for it to work?