If your goal is fat loss you want to have a calorie deficit.
If you want to maintain your weight you need to have an even calorie balance of your metabolic rate.
If you want to gain weight (put on muscle) you need to have a calorie surplus.
Depending on what you want to look like (lean look like a dancer or long distance runner, or more muscular look like a figure model or just a smaller version of yourself) will determine your macro-nutrients and what type of workouts you implement.
You can read more about what body type you are by clicking here to read more.
If you would like to work with me and find out how I can tailor your fitness program to your dream physique please click here.