I really like those skills for a new 18 year old. I think he will be a very good player for you, and should be well worth training.
If you want to train him as a big man, I would recommend rotating Inside Shot, Inside Def, and Rebounding (perhaps 2 weeks IS, then 2 weeks ID, then 2 weeks RB, etc.). These three skills are probably the most important for a PF, and he will benefit greatly from improving in all of them.