I just can't get the hang of breastfeeding.. how do I start exclusively pumping?

I don't want to quit so i am planning on exclusively pumping. . . . Can you help me start? 1 - which is the best double pump? 2 - how do I start/build up my supply? 3 - how many times a day should I pump 4 - how do I build up a supply when still feeding my LO? all and any advice welcome! I have sought lots of advice and have been observed feeding etc I just can't get the hang of it 🤦🏻‍♀️