I'd start with passing, lots of passing right now. It doesn't matter if you want to a PG or a SG passing is extremely important and it's his weakest skill right now.
I don't think you'll need to touch his driving and his jump range, they'll get the odd pop just training the other skills and that's all they'll need. Stick to the other 4 categories and personally, I'd keep them as balanced as possible. That's going to give you the best player for the lowest salary and a guy that can play both backcourt spots.