How to get abs/flat stomach?

I’m only 14, but I want abs or just a really flat stomach. I guess I’d be willing to go on somewhat of a diet but nothing crazy. I do 5 different kind of abs exercises everyday 20 each (so, 100 total). And I don’t really see that much of a result. I want to be healthy, and I want a flat stomach/abs. Any advice? Tips? Diets?