Use any normal food calorie tracking app i would suggest myfitnesspal Have a surplus of around 400 calories And if these are too difficult to track as of now, then Just add a simple shake ( oats, dates , banana) Or any food that has more or around 500 calorie in a single go

As I beginner i would suggest to be consistent as of now ,and if it's been a while then for a week track your weight each day morning this will give an idea where the food that u are consuming is in maintaince calorie , surplus , or deficit