I started over 20 years ago with three or four lessons from a great guitar teacher that a friend referred me to. His method was to take a song you like, then break it down by structure: ie: Verse 1, Bridge, Chorus, etc. Each week we spent the hour reviewing one section. Then I would go away and practice just that part - most of the time using the method of having the track play and I play along but louder. That was a great introduction for me. Just strumming chords and picking basic parts (Boston's More Than a Feeling).
Then I spent a year or two by myself applying the teacher's method: listen to the song and figure out the chords, break down the structure, etc. The real eye opener happened in my third year: a community college private instruction course.
I told the instructor I wanted to learn the fretboard past the "cowboy chords" in the first position and basic barr chords. So we settled on 12 bar blues and pentatonic scales. That was a great experience - laid back, fun, instructional. All sessions were recorded on tape so I could go home and practice.
After that it was the tab books, play along, etc. However, my son's experience was very different.
A buddy of mine played the LA scene in the hairband days. They never broke out, but he can really shred on electric. He was hanging out at our house one night right after I had picked up a new electric. Up to this point my kid didn't care a lick about guitars. But upon hearing my buddy run through a couple of songs he immediately ran into the room...can you teach me that?
They setup one lesson, but my kid didn't really have the patience. He already was playing sax at school and piano at home. But, learning the guitar at first can be very frustrating.
What really accelerated his growth were those instructional videos on youtube. He would just watch those a couple times, try to play, watch again. He learns songs in 30 minutes now. He is a speed demon on electric (Breaking Benjamin, Three Days Grace, Ozzy, etc). I wish I had the net back when I was 14.
The other day he wanted to learn Zac Brown's song Free. So, he pulled up a youtube instructional video on his iPhone, watched it a couple times while it was on his knee, noodled his way through it on acoustic, and now it's in his repetoire.
I really suggest leveraging the net. We also have apps on the iPad and iPhones. There is so much content online it boggles the mind.
Hope that helps a bit.