It's best to take direction from one of the LLL leaders but I can chime in with a few words on pumping. I've been nursing and pumping for 4 1/2 months now... When I'm at work I pump both sides and I don't think I've ever had equal amounts come out of both sides. It's always lopsided, and the side with more milk changes all the time. I guess I just feel better when I've emptied both sides completely. My baby never ate from two sides at one feeding, so when I'm with him I alternate sides and sometimes pump the other after done feeding (I never was coordinated enough to pump and nurse simultaneously - ha).
Hope this helps,
Mommy to William, 4/29/09, 7 lbs 13 oz, 21 inches.
Mommy to Evan, 3/18/06. 7 lbs 3 oz, 21 1/4 inches.
Nursed both boys to 14 months