Answering question #1: You need to wire power and ground to both the logic connections and to the motors connections. You can see those connections labeled in this photo. As for connecting the wires, your Rambo board should have come with a terminal block connector that plugs into the board like this one. For my wiring I jumpered between the two power and to grounds like is done is this photo, but I kept the jumpers much tighter to the connector so that the board would fit into this case.
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