1) Choose your members VERY carefully.
2) In most of these deals, one or two members wind up doing ALL the paperwork, arrange for all the maintenance, and suffer ALL the headaches. If you're the one thinking about starting one, guess who that will be?
3) Find a WELL qualified CFI to conduct THOROUGH initial checkouts and recurrent training.
4) Make a training plan, and REQUIRE ALL members to complete it, or no fly. You don't have to put on the training, but you need to specify what meets the requirements.
5) Include a provision in your bylaws which permits you to get rid of a member for cause. There'll be one, trust me.
These things CAN and DO work out well, but only if they are well thought out to start with, and everyone plays by the rules.
MTV