I had a coworker bring me a onsie that her two month old had worn. I found that smelling it while looking at ultrasound pics of our babies really helped with milk production. As a matter of fact, I'm only 7 days into pumping and I can collect a total of 1.5 oz in a day (that's with 7-8 pumping sessions a day).
I've also found that massaging my breasts while I pump helps. I got a hands free pumping bra and that helps free my hands to massage each breast (and yes, sometimes get some work done too).
I'm not sure if they are helping or not, since I've been taking them the whole time, but I've been taking goat's rue and More Milk Plus every day. I also got some Mother's Milk Tea. Like I said, I have no idea of it is contributing to the success I've been having, but I plan to continue!
Good luck!!