just get a bunch of your buddies together and start it, and if it's any good, people will eventually want to join, spread the word around
but make sure your club is fun and dull and boring, have something that your members will look forward to
If you want to start a club, just get some friends together and arrange times to hang out, like a shedual. And eventually get others in on it. Don't start a gang, thats dangerous and not worth your time.