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IM new and i want to know how to make/join a clan?
Listen and Game
You can't.... yet. Halo 2 will have a clan tool, and that will be interfaced with Bungie.net. You can, however, create your own group and join other groups. Just go to the community section on your navigation bar and click "The Seventh Column". Welcome to the forums, and thanks for posting your topic in the right section!
Heres another good guide to help you start off a clan, I would suggest reading it if your serious about doing the clan thing. Here you are!
If you want members, trying making a website, like so...