If you don't mind my asking, what exactly do you want to come up with. IMO it doesn't matter what it is, as long as you are happy with it that you'll love and care for it. If I knew, then I can guide you more specifically. Is it colors only, not caring about fin. Or is it IBC standards. IMO either way you can start with pet store betta.... I do.
Btw, it turns out that my eyes are not as good, because my spawns does have fry. I just couldn't see them (I use black buckets and place them under my aquariums). There are only a few, about 5 - 10 per spawn, but it's a start. Hopefully I can show you the results next month or two.... if I can keep them alive. Wish me luck.