Trying for a 2nd time. Advice please.

Well I am only 12 weeks pregnant but with my daughter I tried bf her and she wouldn't latch on right, made my beasts bleed and I gave up and ff her. I want to try again with this baby but I'm not sure where to start once I do start. I will be returning to work once the baby is born after my 6 weeks is up. Can I immediately start pumping once baby is born? Do I have to wait ? I intend on buying a breast pump but I'm not sure when you pump and when you actually let the baby feed off your breast. When my daughter was born I asked to see a lactation consultant and they never sent her in to see me. I asked multiple times.