breastfeeding... things that help..

This is my 4th pregnancy I'm around 5 weeks & 2 days. I've tried to breast feed with all my kids and it usually only last 1-2 weeks, I'm lucky if 3. My 1st had really bad reflux so it just wasn't working, my last 2 couldn't get rid of jaundice even with doing the supplementing with formula. On top of that I always have so much nipple pain & cracks even bleeding, so I'm a little afraid. I want to try no matter what, I just wish it wasn't so pain for me. Any suggestions...... techniques that help or what pump is best... Thanks!!!!