whoa, lots to learn. Been there. You want to set it to dat as opposed to adat, uv16 rather than 16 or 20, crystal,soft limit off, phantom off, +4 for running out of the board, and adjust via right/left gain knobs. Run 48k.
As for input, just run xlr out of board into the xlr inputs. If you have an aes cable, use it as opposed to the 15 pin>coax>4pin xlr power connection. Sturdier c onnection.
As for the word clock, you know it's bad when you lose your lock on signal. You will see the clock run through it's cycle without locking on 48. Big trouble. Taking several passes to lock, however, is not necessarily a problem at all.
Good luck. The thing is a frigging time bomb. Hope ya got it cheap. But a helluva unit, no question. I've had 4, I think. Marc.