143
It is still a broad question depending on how far you need that to go. The simplest suggestion is to utilize the Groups and Permissions to its fullest. Lots of admin work but that's what a good site needs.
Treat the Registered group almost like anonymous. No special rights. The secondary Group(s) should control access and rights to club content. If a Forum category is only viewable or editable by CarClubA group members then this does the trick. Same for other modules that support it. Give groups access to their own Forums, News categories, Calendar categories, etc. CarClubA_Moderator group members (for example) might have admin rights to CarClubA content.
One tip I could make is to create a webmaster user that doesn't belong to any of the special groups. Use that login to maintain the site and group access. Much much cleaner than your day to day account or webmaster.