All I know is they take lots of work.
Well, I probably know more than that but that is what sticks out to me.
I've been living in an intentional/spiritual/permaculture community and it has been around since the late 60's. It's a miracle it survived too, because they made it a no-drug place and their numbers went from 100 to 3.
They have all their by-laws in place and still maintaining the place wears the residents a little thin.
I am actually in the process of starting a smaller-scale community on the same mountain with less structure. (Lama has wake up bells, morning meditation time, breakfast, daily meetings, work time, lunch, work time, dinner, and some evening practices or gatherings). The few of us who are in on this idea together are all pretty sure of what works and what doesn't work. We've seen too little structure in community and we've seen too much. We've seen lots of stuff and it seems the consensus process that the Quakers used is by far the best way for everyone to be an equal member.
We are buying land together and everyone will own the land and buildings. We will have a community center and everyone will have private residences as well. Our structure is still "in the works" as we figure out just what it is we want to create.
I guess you need to set your intention and then ask yourself questions like, "What is necessary to make that happen?"
The community where I have been living has a mission statement and when decisions are made at business meetings and such, they have to refer back to the mission statement. It seems to be a grounding point that you can always come back to when things get a little wild.
I wish I had more tips for you.
Lama has had soooo much help over the years with many, many people coming to help build houses and work in the gardens. It is an amazing place and I hope to see much more communal living happening in this country.
Good luck!