If cost isn't an issue than buy adult multigene (recessive or codom depending on what morphs you like or want to work with) females and a subadult or adult male (multigene recessive or codom depending on what your females are). Figure out what morphs you like on worldofballpythons.com and once you know what morphs you like and want to make more of people on here will be able to advise you better on what pairings you want.