scarlet badis ...interesting.
I'm not a professional or anything but this is how i would approach this.
Set large goal to hit yearly or very few years and set mini goals to hit very few months.
• yearly/multi years goals.. what i would work on is strengthening what the fish already have. If the fish is red make your family more red..bring the max out of your fish. I would raise the highest number of fish you can so you can select future breeder from.
• mini goals ... what I would work on everyday/weekly/monthly? I would keep the feeding/maintenance the same in every aquarium. Every set of fry will be kept separate with their birthdate so every fry gets judged the same. For example, it's not fair to cull a younger fish at 4 months vs. a more mature fish at 7 months.
make sure you can house all the growing fry and the all the breeder and future breeders.
As for scarlet badis I'm not 100% how well they can handle inbreeding. For example Xiphophorus can handle inbreeding for multiple generation without and issue. White cloud can handle inbreeding for 4-5 generation before they need to be crossed out, and 8-10 generation on linebreeding if you know how to do it.
Inbreeding isn't the same as linebreeding, inbreeding could be siblings or another random relative fish without reason. Linebreeding is very controlled. You'll have to name breeders and keep record. Linebreeding is where you hug one side of the family either sire or dam.
if you have plenty of space I would recommend starting 2 family at the same time, itll give you something to cross to. Chances are you wouldn't want to cross you family back into a normal badis.
I recommend you cull hard and always keep the most healthy fish over the most colorful fish, itll be worth it in the long run. Making your family of fish more colorful is easy, making your family of fish healthier is way harder.
Consistency in size, healthy, color, and temperament is what I look for.
last and not least enjoying the results, i love going back to old photos and seeing my family changes over time.