I'm a skinny teenager too... I've just started Mark Ripptoe's Starting Strength program, which is supposed to help people put on 10 to 20 pounds very quickly.
However, Ripptoe doesn't mention anything about people who aren't mechanically built to squat and deadlift effectively. I'm 5'10", with shorter legs than my torso, so I'm good for squatting and deadlifting.
But since you're taller (and I assume you have longer legs) it might not be as helpful as John Berardi's Scrawny to Brawny because he directly addresses the problems associated with this bodytype.
You should probably buy one or both of those books to get a basic understanding of weight training.
Plus, eat a lot. Eating a big breakfast is a great start but you're going to need to to eat throughout the day as well, especially after your workout.
Edit: I hope I didn't sound like you shouldn't squat and deadlift. You need to! It's just that Berardi mentions the problems you'll face when you do, and has solutions.