Need information on breastfeeding.

I really want to exclusively breastfeed my baby. There is so much inconsistent overwhelming information on the Internet that now I'm just confused ? I have one child already that I did not breastfeed so I don't know how any of it works. Now that I'm having my second I want to give it a try the right way. In the first couple of days when there should only be colostrum is that enough for the baby ? Or is it absolutely necessary to supplement with formula? I've heard that the colostrum is all they will need that early on. I'd like to hear any info from women that are informed or have already breastfed exclusively.