I just started shooting recently. My first lesson took place at my teacher's martial arts studio and was all about safe handling and the seven steps when you shoot (I came prepared with the four rules memorized). There were mirrors on the walls so you could see your stance and where your hands and arms were. My homework was to practice loading and unloading with snap-caps and dry fire to get comfortable with the gun.
A week later, he took me to the range. He had me load and unload the snap-caps and dry fire (I'm glad I practiced, because I was a little nervous). Then we loaded up with live ammo and began shooting. I think I shot 78 rounds that day, .38 special out of a snubnose revolver. Towards the end I was not shooting well at all, to the point that he thought there was something wrong with the gun. I asked him to shoot it and he hit the bullseye, so it was clearly my fatigue that was the problem. He had a rest that we tried, but it wasn't working for me.
The #1 focus of that first day at the range was safety. He put me in the lane on the far left, and if I remember correctly it was to reduce the chances that I would sweep someone inadvertently. He also kept an eye on me when cease fires were called, and I did get one shout of "Hands off the gun!" even with it lying on the bench with the action open. I'm a quick learner, so he didn't have to remind me again.
Keep the session safe, short, and fun. Hopefully they'll want to do it again!