it is more important that they enjoy the game rather than trying to bite off more than they can chew just because you want them to be hardcore sim racers
let them do ovals (Indy) with automatic transmission (all aids on) in a Honda Fit, or any other reasonably powered FF car.
once they mastered steering and basic throttle control, do an easy track with turns (like High Speed Ring) so they start to master braking in a straight line
then gradually start doing harder stuff and driving more powerful cars as they become more proficient. baby steps are key, otherwise if they spin out too much they will become frustrated and hate the game.