He's a guard, and will always be a guard. Whether you want to make him a SG or PG is your choice though.
Either way, you want to improve his OD to proficient or prominent first so he can stand his ground on the defensive end. Add some Passing afterwards so if he isn't open, he can pass the rock. strong Passing should suffice.
After these two, you can basically train any guard skills you like. Some more passing and OD will definitely help, but so will Jump Shot and Range.
Finish him by training him 1on1.