I started with 1 male SHTCT (super hypo tangerine carrot tail), 1 female mack snow, and a female SHTCT. SHTCT are easy to sell and you if you get one that is het some type of albino you can down the line make sunglows/hybino's which are also a really good seller.
It really depends what you like, what your goal is, and how much money you want to invest.