Not all platys get along with bettas and not all bettas get along with platys... I have certain males who can be with certain fish, and certain males who cannot be with any fish... Just forewarning :)
In a 10 gallon, I'd stick to slower fish (platys, NOT danios or neon tetras), bottom fish (shrimp, cories) with a betta. I like to add fabric or silk plants, hidey holes, and live plants. :)
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.