Breast feeding plus pumping???

Petra
Hello ladies, my little one is two weeks old and not gaining much weight. I was EBF but after talking to my lactation nurse today we decided to start pumping and try to boost my supply. I'm new to this and it would be great if you gave me some advice. Like how did you work BF and pumping together? Did you feed from one breast and pumped the other one? Did you pump with every feed, in my case it would be every two hours even more? And when did you give the pumped milk, once every few feeds? At the start of the feeding? Or instead of boob? I'm very confused and I know the nurse probably told me all this but my baby brain didn't get it.. Thanks for any advice, I really don't want to add formula yet..