A new idea is floating around that may yet gather significant support. The first lunar government, some argue, should be formed before anyone is actually living on the Moon.
The theory is that such a prospective government could participate in lunar development from the very beginning, representing the interests of the Moon and its initial colonists. A constitution could be adopted early on, so that when colonists began arriving on their new home, the government would already be up and running.
It's an interesting approach, and would force early consideration of lunar sovereignty, property rights beyond Earth, etc. Such a government shouldn't be formed too far in advance of actual settlement, but the idea has potential.