One thing I'd say is that for the first week, don't go too deep into theory or even syntax. Have him work with tools like MIT's Scratch or Scirra's Construct to build games and in the process, learn how to think in a programmatic manner. Then, once he's interested and hooked, take him through your planned curriculum.
Source: I'm a 16 year old who got hooked on to programming a while ago.
Source: I'm a 16 year old who got hooked on to programming a while ago.