Please all advice welcome! I am 2nd time momma but 1st go around with my son I was stay at home mom didn’t have to pump unless I just wanted to....

I am not very good at pumping.I feel like I can be almost about to pop and I can pump and only pump a few ounces but i can have my daughter nurse and it’s like the flood gates open :/

she is definitely getting enough but I go back to work in a month and I am super nervous I won’t be able to pump enough... help please is there stuff I can do or what can I do to make sure my supply stay up?