Hypothetical—Moon Station Government

You are now in control of a habitat on the moon. It has no ties to any government; its creation was funded by a wealthy philanthropist who just wants people to emigrate from Earth. The cost of doing so is within the reach of a middle-class family if they sell their home; you can therefore expect a decent number of immigrants.

What sort of government do you establish? How do you go about ruling so that your new settlement on the moon will survive and thrive?