Tee work. Take 100 swings daily on the tee. He doesn't need lessons he just needs daily reps with proper bat/weight and mechanics. On second thought, if you don't know the proper mechanics on hitting then find yourself someone who does. Make sure the bat isn't to big for him. Better he swings a light bat now and work on proper mechanics. I see plenty kids swinging bats that are too heavy for them. Heavy bats at 9/10 is bad for the kids, creates bad habits like dropping hands/shoulders during their swing. Find him a -10 or if he's a small kid -12 for now.