this how my shoulder routine has always looked like and they are strong as fuck.
Military press (with or without smith machine, sometimes alternated it with dumbell presses) x 4 sets 8-10 reps (I don't go all the way down, it tears up by rotator cuff, go down to you mouth and up again)
Side laterals (it's ok if you swing a little if you are doing heavy weight) x 3 sets 8-10 reps
Front lateral (I do these with barbell, very heavy and effective to build fron delts) x 3 sets
Rear delts (bend over with dumbells or on peck machine sitting oposite way) x 3 sets
Shrugs (as heavy as you can do them, try doing them with at least 3 plates on each side for starters) x 4 sets
Upright rows (with wide grip, elbows out, once again it's ok if you swing alittle if you are doing heavy weights)
Hope that helps you.