I went back to work at 12 weeks, and I pump 3x at work and make enough milk for my daughter - here is my schedule:
7:00 am - wake up baby and nurse before going to work.
9 am - pump
12 pm - pump
3 pm - pump
5:30 pm - pick up baby and take her home - nurse again around 6 pm.
I am lucky to have a desk based job so I can actually work through the time that I am pumping, but it takes me about 15-20 minutes each time.
And as for BF resource - my absolute favorite is kellymom.com. I also loved "The Nursing Mother's Companion."