If you don't mind, I have spent a long while considering this and have a few thoughts. At one point I was planning on moving to Texas and helping out Basil and Xenia before their split, and have spent a short time living on secular communes before becoming Orthodox.
There are many possible plans on how to make such a community work. Unfortunately, unless a member or benefactor is very affluent, there will have to be a way to create financial income, at least in the beginning. Agriculture and secondary agricultural industries(sawmill, making tofu from soybeans, etc) are the traditional form of income for both Amish communities and for secular communes. I'm not as well read on kibbutzes but I gather that their income is diversified from the talents and work of all the individual members. There are other approaches as well. A few local Orthodox families who are considering creating a community have also suggested taking care of elderly Orthodox men and women - they would not simply be a burden that is taken care of for money like in secular nursing homes, but a community as bound in tradition as Orthodoxy would treasure our elders and help them make the best preparation possible for their repose.
Another idea that I had, though it would require a lot of startup capital, would be to have a small Orthodox junior college in the community. There are so many bad influences on youth these days I think it would be great for those who aren't on a fast track education or haven't eeven figured out if they want to finish college have a small school to go to where they can take part daily in their faith while learning community values and either an associate in arts or science. This sounds like it would need a huge amount of money, but you would really need only a handful of teachers...english, mathmatics, science, humanities(history, philosophy, etc), and the priest could teach religion. Language teachers among Orthodox should not be difficult to find. This of course would not be possible while a community is began, but five or ten years down the road I don't think the idea is completely impossible.
To start, I would say you would need at least five families. After the land is purchased, the first building up would probably be a commonhouse. This is a multipurpose building that secular communities use, and it is a great help in building a full community. A Commonhouse routinely has a large cafeteria-style kitchen and dining rooms, two dormatory sized bathrooms, and several smaller rooms that can be used in the beginning as bedrooms while everyone is building their own dwellings. After homes are built, these rooms can be used for classrooms, libraries, offices, or guest rooms. One modification I would make for Orthodox use would be to add a room large enough to act as the chapel until the group is ready to construct the temple. Depending on the size and the materials used, this does not have to be terribly expensive to build if you use alternative building materials such as cob, cordwood, ferrocement, etc.
Since this is a rather large first post, I will end now, but will post several links that may be of help.
Here are two secular Intentional Communities(ICs, the new name for communes) that have a lot of good ideas. Everyone who is interested in forming a community would do well to read these sites.
Twin Oaks is one of the oldest functioning communes. It was began in 1967 as an attempt to put the ideas in Walden Two by B.F. Skinner into practice. Currently there around one hundred people living there and they have a lot of income methods and facilities.
Dancing Rabbit Ecovillage has a strange name, but they have a lot of good ideas. Again, this and the above site do not express christian morality, but there are many good organizational ideas from these sites.
The best site for ICs in general is The Intentional Communities Homepage. Another good site.
Homestead.org is a good site by a ROCOR couple I corresponded with a few years ago. Lots of good practical info about life on a farm here.
Pacific Yurts Yurts are a very interesting low income housing option that can be set up anywhere, is portable, and can let you live as primitive or as modern as you would like. This is one of the more expensive companies that produces commercial yurts, but their site has some of the best info. If interested I will post more yurt links.
Another type of religious community than the Amish or in Jewish kibbutzi is the group of Bruderhof Communities. The Bruderhof is a group of german anabaptists who moved to NY and PA a hundred years ago and have many of the Amish good points without some of the detractions. This community supports itself by it's publishing house and by making children's playground equipment.
Speaking of the Amish, check out Lehman's an online store that sells many items needed in rural or nonelectric living.
I look forward to discussing this with all of you. Through the prayers of the Theotokos Lord Jesus Christ Son of God have mercy upon us!