Breastfeeding

Hi! I am 20 weeks today so still have a while to go but I am doing lots of reading about breastfeeding. I tried with my first but he didnt lacth properly and I gave up because my milk supply was gone... I didnt have a pump to try and get it up. But this time I really want to so bad! I feel like my first would be so much healtier if I had been able to! He is very skinny and doesnt eat very much! But anyway I want to gather all the tips fron actual mommas that were sucessful! So leave any and all tips that worked for you! I want to know anything and everything I can!