What the best way to lose body fat and build muscle?

I am african american 19 year old 5'6" female. With an mesomorph (basically means very voluptuous body).It also means I build muscle easily. My body m index is 30.7 which pretty much means I am obese stage one. I don't look fat but I was wondering how can I build more lean muscle so I can have a more muscular look (want to look "cut" or "ripped") and I was to burn some of this fat off. I took a body fat percentage test and it said my body has 54 pounds of fat and 135.5 lean muscles. I am trying to get rid of 54 pounds of that fat well at least as much as possible. Accepting any diet, nutritional regimen, exercise, and any other valuable information could you offer. Any and all advice is accepted.