So I don’t count calories or track all my macros, but I do try to keep a running tally of protein in my head and will occasionally go in and weigh/track my eating for the day just to make sure I’m around my goals.
The first place to start is setting a protein goal. There’s uh a lot of opinions on what this should be. .8-1g per pound. 1g per pound of your ideal lean body mass. 2.5g per kg. Some folks say go way over, others say that anything past a point is worthless. Find something that seems sustainable to you, makes sense for your goals, and the type of training you want to do.
From there you’d want to transition into a slight surplus to give the body the best environment to build muscle. Then not unlike weight loss, building muscle is all about consistency. Put the consistent work into your workout program and nutrition program and you’ll get results.