exclusively pumping tips? help!!!!

Pang

hello, just had my son on 4/20/2018. My initial plan was to breast feed, however I feel like he is not getting enough. Therefore i decided to start pumping so i can measure how much milk is actually coming in. Well it's been 10days since i had baby and I cannot produce more than 35ml per breast. any tips or advice? I feel like I cannot provide enough for my baby and always have to supplement