Breastfeeding tips

I'm currently 36 weeks pregnant and still waiting for my baby girl to arrive but does anyone have any good successful breastfeeding tips for a first time mom? I really want to breastfeed but I'm scared I'm going to end up having the same problem that both my sisters had with their babies. They were not able to produce enough milk & eventually needed to give their babies formula. I know everyone is different but what are some things that help increase milk supply right away? I've heard power pumping and lactation cookies can be helpful? Any other tips?