Priority 1 is feed your baby. In the grand scheme of things it doesn't matter whether that's by breast milk from boob, formula, expressed milk or some combination.
Do your research. Try to take steps to remedy the stuff that went wrong last time. But remember that you aren't "doing it better" or purging yourself of some kind of wickedness by successful bf. You're setting yourself up for massive angst if you make this about proving something.
Read Bottled Up by the woman who writes the Fearless Formula Feeder blog. This helped me come to terms massively with my feelings of failure. All I think now is, fuck, why do women let ourselves get hit with guilt by this? Babies need to get fed properly and safely. Period. Do it the way that works for you. Babies need sane mothers who are coping more than they need to be breastfed at all costs.
Now I don't give a toss that DS is FF. He is happy, healthy as an ox and adores me. And I don't care whether the next is BF or FF. I will try my damn best to BF, and try to eliminate some of the problems to getting it started that I experienced this time. But if it's not working, I am not going to spend days and weeks bawling my eyes out and ruining my time with my new baby. Life's too short to do that again. I will try my best to bf, but if it doesn't work I'll move on without regret.
Whatever happens you are going to do your best for your baby. And truly that is all that matters.
And remember, newborn babies do get dehydrated and jaundiced. So don't feel bad for giving your baby formula for this reason. Excessive caution where the health of young infants is concerned is never a bad thing.
Boobs and bottles unite I say.