Buy one or two high end males, the rest get females. 1:4 ratio roughly. You get what you pay for, cheap snakes make cheap snakes... expensive snakes make expensive snakes. Study the genetics of ball python morphs, identifying recessives and co dominants as well as alleles.
Study what combos look like.
Make sure you buy the best habitats and thermostats. Don’t buy cheap thermostats, build your own crummy rack, and then realize you have junk and have to buy a new rack and stats. Just get the good stuff right away.
Ask questions to breeders, watch videos, read, research.
Kaos Balls