just about everything huh? im eating just over 4k lol and im still hungry. to gain you have to eat, 1 pound a week is great, i gained about 10 lbs in 2 months and about 1% bodyfat (from 5%to 6%). which in terms of gain is good. you cant just gain lean body mass, if you only gained lean mass at a low bodyfat, the bodyfat would just get dangerously low. its all trial and error though. if you see that your gaining a pound a week (ON CLEAN FOODS!) then thats good, keep that and have your bodyfat tested once a week or so. and for your exercises, compound lifts (benchpressing, squats, deadlifts, bb curls, etc) like the others said, are the way to go, big weight low reps for intense workouts that really give your muscles a good tear. and for gaining and eating, keep your carbs way above your protein, the protein really needs to be maybe 1.5x your bodyweight, the carbs should be well above that though. thats what will make or break your clean gains, dont just shove things like peanut butter in you for calories.
