I and a few fellow students from an evening watercolour course wanted to start our own art group because the government saw fit some 25 years ago to close eveniing classes as leisure activities. A very backward decision in my opinion.
Anyway, we had no experience of such a venture but we were all confident that we had enough experience in the business world to be able to do this and make a success of it. Of course we made mistakes but by and large we came through. The group has been very successful and we have had to introduce a waiting list for membership.
I have written a book describing some of the experiences from the past 25 years and hope that if you feel you need to start (and run) a similar group, then this will be useful to help you to start without making those silly mistakes/errors which cause some groups to stumble.