You're going to need to find your resting metabolic weight and factor in height, age, and physical activity. Look up "finding RMR", it should be on bodybuilding .com in a forum somewhere is where I found it. Get a calculator and a pen too. When you find your RMR, you add 500 calories to it to gain 1-2 lbs a week, which should be plenty if you're looking for "lean" mass. I suggest doing 40% carbs 40%protein and 20% fats. Again, it's hard to gain a ton of muscle without fat.. If you look at any bodybuilder or most physique models, they go through bulking phases and most likely they will add some body fat.. But you always have time to cut that off and it will look a lot better when you have some muscle to deal with too! Eat 6-8 meals a day, keep complex carbs early in the morning, just protein at night. Get some weight gainer protein, that'll help you meet your calorie intake. Limit cardio to twice a week and don't kill yourself, do low-heart rate. Lift heavy, eat a ton, and rest.
Hope this helps!