re: Racing Simulator set up

Honestly, a sim rig for that purpose isn't worth the cost. To get anything that would actually teach him how to drive a manual would be pretty expensive.

The logitech G series stuff is cheap but doesn't have any real feedback on the pedals so even if he mastered the motions it probably wouldn't translate to real life. Probably your best bet for your intended purpose.

The fanatec stuff is great but it starts to get pricey.

Mirroring another poster, PC is the way to go but I'm not familiar with any console racing simulators and how they are.

Now with all of that being said, if you think this would be a cool hobby:
-PC to run Iracing
-Fanatec Gear (pedals, direct drive, etc.)
-at least one extra monitor
-Racing seat with mounts

I sold mine after I had to go back to work after Covid and I miss it every day.