1. How ever much your spine is tilted forward toward the ball at address, that is the angle the arms must lift to maintain their address position in relation to shoulder turn and chest.
2. If you held both arms straight out as if you were going to shake hands with two people, the arms must rotate in a fashion where the left palm faces down and right palm faces up.
I assume these two simple concepts are lost on most of you because they are lost on almost every golfer I see. They get lost in all the clutter of power accumulators and lever systems.