Jumping rope get me a flat stomach?

i’m slim everywhere but my stomach(i know you can’t spot reduce)
but if i jump rope for 1 hour, with stopping for a couple seconds to get water or when i miss, for 5 days a week how long will it take for me to get a flat stomach.

what else should i do? I’m 14 (no PILLS) and 97 pounds and 5 foot
i try to keep a healthy diet, but i’m not really sure how
i’m 14 years old don’t tell me to try pills