First and foremost no pacifiers or supplemental bottles (including expressed breast milk) for the first six weeks. If your baby wants to suck, put him or her to breast. That means allowing yourself to be a pacifier in the meantime. It also ensures a really good milk supply, as breast milk is a supply and demand situation. Your body will automatically make more.
Also, there are some herbs that help, from blessed thistle, to fenugreek, etc.