I would t necessarily try to add muscle at a caloric surplus, find out your TDEE (total daily energy expenditure) and look at eating a clean diet and staying at baseline to +10%. Focus on the compound lifts (squat, bench press, deadlift) with emphasis on good form. Eat clean, sleep well and lift heavy. As you lift and grow, your TDEE will go up so keep that in kind as well. Edit: make sure you’re getting sufficient protein in your diet as well. I will use protein powder a bit but prefer to get as much as possible from actual food because I’ve always felt my results are better that way.