I think it depends on what you're lookin to do.You gonna do shows and sponosr events? thats a little tricky and probably requires some "tax advice". Or do you and a bunch of your friends wanna hang around a cruise? If so, come up with a name make some t-shirts. The "cost" to get in your club could be the price of the shirt (which you get for "free") Im sure you could also do some "initiation" ceremony too (after all "hazing" is always fun!) you can get some car plaques made up and voila your a club, you and your guys can go to shows together and get a little banner to put next to your cars. Maybe get a WWW site and have "monthly" meetings...
My dad is a member of "golden state rods" they are a Big club, but the only thing you do to join is buy a jacket...