Consider this fun and "try and error"......
If you really want to understand the genetics of it.......you are in for some SERIOUS reading up on Mendell's laws, dominant- and recessive genes, allel genes etc. etc.
I bred colour-variations of angelfish years ago - also creating new colours - and to be honest, I never got completely sure of several strains. I would suspect, that Guppy strains have way more genetic confusion, than the angelfish.
- it's defenitely fun, though, just to *mess around" and see what happens