15 years old and need help with mealprep

Im currently 5,6 at 15 years old, I need some help with meal prepping and how to plan my meals, if anyone has tips to help me, I was wondering if there were any foods that could help me get taller and if there were any simple recipes that could help because all of my meals are just made by my mom currently, I am unhealthy but I have started to go gym to fix that and need some thing to track my calories and protein.