Pumping question?? FTM

I'm hoping this is the right group...but I'm trying to breastfeed but my little boy doesn't seem to like it all that much. Granted he is only 6 days old but still. Right now we're focusing on weight gain so hopefully after this coming Friday after his second appointment, he'll be back at his birth weight so we can start to work at breastfeeding.

Anyways, he sometimes latches and then falls asleep or just gets frustrated and doesn't even try and just again, falls asleep 😂😭 So I've gone ahead and began to try and pump as much as possible. So far I've done two 30 minute sessions and the first I pumped 10 oz combined and that was after sleeping of course and BF my son for maybe like 7 minutes total. My second session was 6 oz total. I meant to so a 15 minute sessions but Mom brain..

With that said, how many times should I pump and for how long? I really want to build up my back up supply for my little boy but it's difficult when he's eating about 2 oz every 2 hours. I ordered some milky mama starting kit so I hope that helps. But any advice?? I feel like a bit of a failure since I can't get my little boy to latch or to stay on and suck for the 10-15 minutes on each breast. He was doing it in the beginning but I think I was pretty much a pacifier with the occasional suckle of milk..