Advise please:(

So today I decided to get back in shape.I am 14 years old 5’3 and 129 pounds.

I took some day one pictures to show you guys and show you through my journey. I’ve had a past of self-confidence issues but now I learned to love my body because God gave it to me. Any advice, diet( i am a vegetarian) , exercises, anything you guys could help me with. I mostly wanna focus on my belly and my back roles as long with my butt and loose weight in the thigh area. Any apps I can download? As you can see I’m smiling in this picture because I love me and I’m not changing for anybody except me❤️💘🎀