Babies are generally born hardwired to breastfeed. They are perfectly adapted to their situation. Colostrum, the first milk is all they need. While it comes in small quantities (perfect, because baby's stomach can only accomodate 5-7mls in the first days) it provides them with all they need. Stores of brown fat laid down in the baby's body meet any shortfall. Formula is simply unnecessary and filling your baby with formula can make breastfeeding more difficult.
A great investment is a subscription to the Australian Breastfeeding Association which includes their great book - "Breastfeeding....naturally" and for an extra $20 take one of their great Breastfeeding Education Classes.
for more information, go to Australian Breastfeeding Association