ZAZA
Where are you based?
For groups you can:
Check out the club advert boards, but also ask the regulars & instructors at each one.
I have bought shares twice now. The first group had 9 in a near dead 150. I was pleased to get out before the engine quit.
The second group I have been in for 9 years, thick & thin. Both were found from the back end of Pilot mag. I understand that there are even groups with more than one aircraft. (Is that a club? I'm not quite sure).
Absolutely vital is a decent set of group rules. Like any contract, they are completely pointless until you need them...