I would start you at 2500 cals and see what happens. You're young and growing so you may need more cals than that.

Try to keep your protein intake as high as you can and keep your food sources clean. Aka, try to stay away from fast food, pop, chips, candy, etc etc.

As was mentioned, start learning proper form for the squat, deadlift, bench press, and military press. Once you have the form nailed down slowly start increasing the weight. These exercises will put muscle on your body as you lift more weight.

IW