Hello.
I have replied to your separate thread here, which I think answers most of your questions. However, to clarify about the servo wires, the green wire is optional and gives access directly to the servos position feedback potentiometer. If you want to use the feedback, you would need to connect it to a pin on the Romi 32U4 Control Board that is capable of reading analog signals, but it is not needed to use the servo normally.
Brandon