Well, aside from titles (which are usually for people who are moderators(etc) on the forums, or divisional leader), there isn't an actual ranking system.
The way I'm making the roster, it will display members forum names in a table, along with games/realms that the clan supports, and each spot will be marked with a green check or a red x depending on whether or not the person plays those games. You'll just have 'x's across the board until you start playing something.
edit: I also included the template at the top, although I'll admit it doesn't look too different yet. lol.