Pixierella, I am a collector and , by no means, pretend to know a lot about breeding. But I have been doing a lot of reasearch at the urging of my husband because he believes it's the most logical thing to do since I seem to want so many dang fish.
But here is what I do know from my research. . .
Adastra is absolutely right in saying you need a definitive goal before you start. Figure that out and THEN start looking for fish.
Once you figure-out your goal, research, research, research! There is a whole lot more to breeding the Betta you desire than just putting two colors you like together? How did the two you are breeding come about? What is their pedigree? By knowing these things, you will have fewer "surprises."
From what I can tell, it is best to find a reputable breeder that has a sibling pair with most of the traits you like. You breed these for several generation until you have consistency and then you can begin introducing new traits while still keeping in mind the genetic history of the new breeding stock.
That's just the start! The more I research this, the more excited I get. It's like a big ol' puzzle and I love me a good puzzle! But it's not uncomplicated in the least. You want to try to breed THE BEST BETTAS! Not just A Betta. Remember, you are going to have to find a great deal of homes for your future spawn and the better the quality of the fish, the easier this is going to be.