Help with turn based combat system with stats, etc

I’ll echo in with the others that you’re going for something elusively very complex. I went down this path, too.

Since you mentioned that you’re new on combat system, maybe you should start basic with narrative-based combat. It’s not necessarily as “plain” as a simple linear narration, but it can capture the same awesomeness and strategy nevertheless. Take a look at Supra Humanum WIP or Lone Wolf Saga gamebooks. Holy Ordos is a good one to look into, too. Otherwise, libraries from Delight Games are a good reference if you’re willing to suffer through its monetization scheme.