There is a sweet spot in the size of a community. When it's too small it blows up. When it's too big it's just unmanageable. There are numerous religious communities, but only a handful of secular communities survived since the 1960's-70s --One success story is Twin Oaks. You might look into it for its governance and size. It has maintained 80-100 people and has lasted half a century. For religious communities, the Hutterites have a member size of 65-140 people. So that's a sweet spot in size of adults you could begin with.
Today is a wonderful time of opportunity because the youngins are questioning everything and seeking alternatives, not by choice, but because the traditional ways of having careers and families are comical and economically ridiculous. You could find other like-minded families to build community of 100 adults and follow the Twin Oaks governance structure. i'm not familiar with governance of the religious intentional communities but I would only focus on the ones that have been around for a long time.
