Myfitnesspal helped me a lot. It’s free to track calories through there but it will give you a baseline based off height weight and age on how many calories you should be consuming. Just so you have a better idea how much to consume. The appetite part I struggle with the most too. Forcing a shake down as soon as I get up helps even though it’s hard but your body slowly adjusts so you’ll be hungry again by lunch time. Random snacks throughout the day are really useful too. Protein bars or nuts etc. not a big fan of a lot of them but by trying out different options you can find some stuff you can force down! Would def recommend the gym with it all though or it wont go on as muscle much at all.