Having had shoulder surgery I know of where I speak (for me anyway). The lighter the rod the better. Look at the number of ounces it weights. Get a light weight reel too.

This won't work well with the salt. I would suggest he wait for saltwater fishing until he gets to a place where his casting is smooth enough so he won't reinjure himself. That won't take too long, but a good casting form will help prevent future injuries.

jed