I play the guitar. I am interested taking the challenge to teach your son.
But primarily I'd like to know what your ultimate goals are?... is it that you want your son to start playing songs and rythms as soon as possible?
This will take approximately 3 to 5 months depending on how much he practices.
or are you looking for a formal guitar education wherein notes will be taught first and then chords...
this process will take approximately 1 to 2 years b4 he can play depending on how he practices ..