Look at some of the other clan topics to get a general idea, and make one of your own. There's no specific format to copy; just talk about what your clan is all about. Some things you can add (but aren't required to be included) are a general goal for your clan, a list of it's members, it's base, what it's done in the past that has affected the server in some way, etc etc.. All sorts of fun stuff.
It's all up to you, what you want your clan to be. It's really much more simple than it would seem.
Hope this helped you out.