yeah Mike, it sounds like 65 knows better than me (i was thinking that it would be hard to get fluid out of the rack without the pump working).
either line that goes to the cooler is a low pressure line. the fluid goes from the pump to the rack through the HP line, then exits the rack to the cooler (via one LP line), then leaves the cooler (via another LP line) to go back to the pump. pick either line (i use the one from the rack to the cooler since it was low - good for going into a pan). you can also disconnect the LP line at the pump if you want - it does not matter.
for bleeding once the flush is done, i like to jack the front end up (takes stress off the rack and pump while bleeding). turn the wheels back and forth, almost lock to lock, but dont hit the locks (you know how it sounds as it loads up near the locks - which is bad). it will purge the air out as you turn it back and forth, like you said.