What diet/fitness plan should i stick with to lose my tummy/muffin top in a month?

I am 14 so i’m not planning buying some diet books or fitness videos.
I am very busy but I can certaily take some cycling/yoga/pilates classes if this will help.
I’m not planning on looking perfect in one month… just better.
I am 5’2 and have no hips so its important to make my waist and abdonimal thinner and i hope to lose 5 pounds doing it.

I will pick a best answer…
Thank you!