Breast feeding/ bottle and formula feeding

I know its probably early to think about this. But let me just start with this is not a debate as I beleive feed is best! I am on baby number 3 and have breast and formula feed my other children. I breast feed my son until he was 18 months old is had to formula feed my daughter because I didnt produce enough milk for her. I would love to be able to breast feed this baby and plan on pumping for bottles at day care but how can I make sure im going to produce for this baby? Again I will do whatever is best for baby when it comes down to it! Just want to try to breast feed as this is going to be our last baby.