Breeding for 1 tail type and 1 color you would need at least 2 pairs - to later cross fry. Then after a few generations, you will need to buy new pairs to introduce new genes. In short with parents and fry, you might be housing 10 pairs.... unless you plan to sell the parents after you get fry. That's only 1 tail type and color.
The more types and colors you work with, the more you will have to house. So the question is; can you house 100 or more bettas? And this gets worse if you work with combined genetic colors, like super red, etc. You will end up with 3 different colors which you need to cross once in a while.
I'm not trying to discourage you. I'm just trying to point out the facts you will most probably face.
IMO, it's better to work with one type and color. Work on the fins towards SQ - this alone might be tens of bettas. Once you get SQ that breeds true, then you could reduce your collection and plan on a different type. Remember that every few generations you need to get new genes which may destroy your line. You need to work with other breeders whose line is compatible/supports yours .