What do you mean "start him off" with programming? You can't exactly buy and package "programming." Why don't you tell him "son, here's this computer. This is g

What do you mean "start him off" with programming? You can't exactly buy and package "programming." Why don't you tell him "son, here's this computer. This is google.com. Google 'how to program'. Find something that looks cool." Let the kid mess around for a while and find what's out there. Afterwards, something like codeacademy.com would be a good starting point if you want a more structured approach.