I agree with Armchairflyer, invest in a good pc sim.
Alternatively, if your friend wants to follow the free route, try out
Angle of Attack. They have some great videos (made in fight simulator) explaining the basics that may be very helpful to your friend.
They have a free account that lets you access the videos. I think for a new flying student, it would be quite helpful to visualize what different things look like while have a different view perspective of the aircraft.