A few things first:
1. Don't cross a regular normal or pastel male to anything: There is an overabundance of ball pythons in the market most notably Normals and Pastels. If you do: Plan to keep all the offspring indefinitely or sell them as food for snakes that eat snakes.
2. Males can reach breed age in a year. Females can take up to 3. Always pair the best male with your females to maximize your efficiency.
3. Some genetic combinations have defects. If you are planning to breed: Learn what these are in advance and work around them.
Now: How much white do you want?
If you want solid white in patches/sections that is one set of morphs.
If you want white speckles: That is another set.
If you want overall white coloration (absence of yellow): Axanthic--That is another set.
There are a few genes that can give you some white when crossed with a normal ball python, but, mostly speckling/splotching (e.g. Calico/Sugar and/or Spider-pictured below). This is probably not what you are looking for-you will need different parents to produce snakes with solid white marks.
Note: Spider is not a good choice for a novice breeder due to its pre-existing head wobble issue: Shown only as example of white inclusive side patterning.
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