Here are a couple of useful web pages for learning genetics. IMO. The first is for corn snakes, but genetics works the same for ball pythons, corn snakes, mice, fruit flies, etc. Learn one and you are good for any of them. I wrote the second. It's short but does not have the mistakes in the sticky in this forum.
http://serpwidgets.com/main/genetics01
https://ball-pythons.net/forums/show...bones+genetics
I agree with Deborah that the cheapest parental generation is axanthic pin x pied. Brother x sister mating. They produce pin DH axanthic pied and normal looking DH axanthic pied.
Then mate one or more of the pin DH males to either pin DH axanthic pied or normal looking DH axanthic pied til you get either a pin axanthic pied or an axanthic pied. Raise that and mate it to a pin DH uncle or a pin DH aunt .
Good luck.