swinging question? shoulder?

[landshark]

been reading and viewing pieces on swinging and have a question regarding the shoulders. ed-z's drill on the whip is good, but i don't understand if i should rotate starting with the left shoulder or the right? if the left, how does the right shoulder go low and down plane to the ball? if the swinging motion is like a flywheel, i would think it would concern mostly the right. one more thing: should i work on this more than just trying to get the hips to initiate as doyle seems to advocate in his lessons? thanks for any clarification.