Supply Increase

Any tips on increasing milk supply? My daughter will be 6 weeks tomorrow & I go back to work in a few weeks so I wanted to start pumping & storing for her . When I pump , I can get maybe 3.5-4 oz on my left breast but barely an oz on my right and I don’t know why. I also only get to pump maybe once a day because when I try to pump more than once , I get only 2 oz total each time . Please Help!!