Exclusive Breastfeeding/pumping

Hello ladies I’m 5 months pregnant , due in July. I plan on giving my child breast milk however through a bottle , with my first we had a lot of issues with nursing and then transitioning to bottle when it was time, so this time I plan to pump and feed through a bottle. I am wondering if anyone has any advice for exclusive pumping & is there anything I can do while pregnant to boost my milk supply ?

Also did you ladies pump before baby was born ? How did exclusive pumping work when baby was first born ? And you were still in the hospital ?

Thanks in advance