1. AP racks, RBI, Vision, all these are good, inexpensive (compared to others). You will need a CB70 sized rack for breeding. I would not try to build my own until you are more familiar with their needs. You can build your own bator, fridge, cooler, check the DIY on this site.
2. RDR, 8ball, NERD, all these guys have nice lessers. I got a hatchling from 8ball. Babies are running 6-700. Adults would be out of sight.
3. I would suggest staying away from pet stores. Buy from breeders, reptile shows are a good place to get adult females. Probally looking 2-250 each.
4. Everyone else is right, don't just jump into this thing. I bought my first bp in 05 and this is my first year breeding. I have spent over $25,000 so far and haven't produced a snake yet!!!