Clubs vary a lot. Paul Tomblin gives you a lot of good questions to
ask but misses the most important ones, in my opinion:

What are the rules? And I mean all of them. Read them carefully.
Remember, eventually they will probably be applied against a member in
the worst possible way. That member may be you. Be sure you're OK
with that.

How are rules made? Do all rules have to be approved by a majority of
the membership? Or just the majority of those who vote, and if the
latter what constitutes a quorum? Or can club officers make rules? Do
they like to?

The primary problem with clubs is that they tend to have more rules
than FBO's, and WAY more rules than the insurance company will impose
on you in a partnership. On the other hand, it's harder to walk away
from a club than an FBO because you're invested.

Michael