Supply help ?

Okay mamas so my son is now two weeks old, he was in the NICU for a little and bottle feeding was just more convenient at the time! He’s latched and breastfed some but he’s 90% bottle fed at this point. I do still have milk! I leak through my shirt daily and IF I do pump, I can get up to 140ML most times. My question is what should I be doing if I want to get to exclusively breast feeding?

How do I know how often to feed and for how long?

How do I know if he’s getting enough?

How can I up my supply ?