lol, basic market research should be number one on any business plan before anything else is brought or planned, you say you have everything planned, but without this information, its useless.
To be honest, selling mixed guppies will never make you any profits, its unlikely even to cover your costs.
Making money from breeding is possible, but you have to be very organised & breed selectively, choosing strains which are currently in high demand, unusual colours or tail types, the featherfin are selling for very good prices in the UK at the moment, I dont know what the US market is like. If you were to get yourself some high quality pairs from a breeder then you could have some success, but you would need loads of tanks, one for males, one for females, several breeding tanks, fry tanks etc.
Is aquabid american? It would be a good place for you to research.