Nipple and breast stimulation can include suckling a baby, pumping, massage, or hand expression.
The hormones required to induce lactation are prescription-only in the US. It's usually a series of several injections. They really do work- even men on these drugs will produce milk.
And about cup size- good heavens, yes that's normal! The breasts usually increase in size quite dramatically during pregnancy and while breastfeeding. One, two, even four cup sizes is not unusual! Some women go from an A to a DD!
Bestfeeding is the best book about breastfeeding out there, get a copy ASAP. Also, la leche league's the womanly art of breastfeeding.
And again, I want to point out that using formula is going to work against breastfeeding. Supplementing with formula almost always leads to full formula feeding. Bottled breastmilk is also going to be counter-productive. A pump just can't extract the milk like a baby can, so the pump will not get enough to fill the baby. Then, as the baby uses the bottle, his desire to feed at the breast diminishes.
When pumping to increase supply, you have to just dump the milk. Feed baby all he wants, then pump a good 20 minutes. Next time baby wants to nurse, offer the breast again.