How do you stock up on breast milk?

Cece

I'm going back to work in 2 weeks and need to build a supply for baby. Anyone have any tips? Usually when I try to pump, baby is still hungry so I don't end up pumping. Or when I do pump my husband needs some of the supply so I can nap. I'm eating lactation cookies but I'm not sure if its helping or just placebo. Any tips? What did you do?