J.D.
CONGRATULATIONS! It takes a strong, brave, determined mom to breastfeed and you are doing great!
The first 3 weeks you, your baby, and your body are all trying to get in sync, and then it gets easier. Your production will be better if you pump and just freeze it (they sell special baggies) for times over the coming months. Also, there are milk donation sites for people with cancer and babies with special needs, so it won't be wasted:)
Feed on demand, and watch her diapers and weight-gain -- that will tell you best if she's getting the right amount for HER. Nursing every two hours was typical for my children -- nursed each side 20 min, for 40 min total, and started again around 80 minutes later. There were times when my son nursed every 70 minutes -- I was a "milk maid" for those 2 weeks:)
You could also pump during "missed" feedings, such as during naps or in the night. I needed around 1 hour to "produce" another feeding but each mom varies. LaLeche has a great 800# with pre-recorded information and pamplets you can order too. 1+800-LALECHE ###-###-####) and www.llli.org
Good luck and keep up the great work!