You may ask why. Despite the obvious historical, liturgical, theological and polity differences, the OCA and the UUA are functionally the same size, both have congregations that end to serve as regional hubs, each has a decided regional bias (though very different regions) and both take a lot of understanding in order to be acultured to how each does religion. We are close to a common understanding of what a new parish should do and how big it should be. (I won't use the term "full service" which is better suited for an old-fashioned gas station.) We could learn something.
This guide deals with the phenomena of organizing a new church. It thinks in terms of phases, and recognizes that certain phases have different needs than others. Do download and review.