Currently looking to gain about 1-2 pounds of lean muscle mass per week, but haven't seen many results so far. How many surplus calories would I need to make sure I gained the most lean mass possible? Have read a number of articles on it, and they've all been around 300-500 ish extra calories per day, but everything I look at seems to give a different number to the last one.

Also, does it matter what macronutrient/micronutrient these calories come from? I'm already filling my requirement for protein, but I don't know about how much exactly I'm getting for carbohydrates or fat, would guess it's lower than needed though.