As long as it won't throw any malware or the works at users, I suppose so. Not sure why you'd bother with a chatroom when people should be talking in the club.
You can be an owner of many clubs and a member in many other clubs. Just as long as you're willing to contribute and not be dead space, join all the clubs if you want.
I don't see why not.
I'm not a mod but there's no restrictions on that.
As the above user stated, there's no requirements to make your own club. Simply make sure you create and maintain a good club by following the rules.