Oh, hi there.
Well... I had two clans long time ago... all I did to create them was simply editing my about, adding info about it, and inviting people to join - and, therefore, put into them profiles.
That'd actually be a club, though. The other clan I had was a Shell Shock Live-related one, where I'd have scoreboards and rules in my about and organize matches through commentaries.
The whole thing about clans is a little... outdated. Yet I think that'd be it.