Breast feeding advise pls

Hello, anyone who could help me prepare with breast feeding? This is my 3rd pregnancy, 1st and 2nd pregnancy unsuccessful yung attempt ko sa bf, super konti ng milk na naexpress. 6-8hrs of pumping 4oz lang nakukuha, I had inverted nipples and I think this time nag improve naman sya as compared to my 1st 2. May I ask for you reco sa breast pump? Yung maganda sna na affordable pa din naman. Thank you in advance!