Welcome to the forum. I would say start with one BP and spend at least a year keeping it so you can learn the habits and peculiarities throughout each season.
Since you are also interested in breeding, you will need to also look at the cost of setting up the incubators, housing, and food supply for the hatchlings. And depending on the market at the time you may have to care for them for a fair amount of time before they sell. As well, you would have to learn the proceedures and certifications for shipping, and accepting payments, taxes, etc...
As far as what to start out with cost wise, I would have to say a female normal and a morph male. Or a pair of Hets. You have definitely got a long road of research and preparations ahead. The initial step would be to master the care of your first BP. Just my opinion...
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