You should talk to your parents and get their help, since they buy the food and will have to make sure you have adequate healthy options vs junk food to eat.
Make sure you have protein with every meal/snack.
Breakfast : carb, fat, dairy
Lunch : veggies, protien
Dinner : protien, veggies, (small portion) carb
Snacks : fruit, veggies, dairy, protein.
What is your calorie limit?