you can also check out the AMA site for benefits that you get if you make your club an AMA chartership, etc. We at WOS opted not to do so because the cost seemed to outvalue the benefits, etc. But we are an established club as well. Maybe it would make sense for a new club to do so. By doing so entitles you to discounts on insurance, towing, repair, dealerships, etc. etc. Its all on their site.
Setting up a club is only as hard as you chose to make it and depends on what you expect to get out of it. It can be very simple or as Gasman said very complicated.