How to get a flat stomach?

Okay, so im 16 and I want my stomach flatter. I don't want abs, (i think that's ugh on girls lol) just a flat tummy. Any suggestions would help alot! Things that I can do at home, that's free and not too time consuming. Also, any excercises I could do to tighten and tone my thighs and calves would be awesome! Thanks! :)