Having recently introduced my girlfriend to shooting, I would add:
-Reactive targets make shooting more fun
-With each new gun/caliber, only load ONE round into the magazine/cylinder until the new shooter has a feel for the gun
-Proper hearing protection is a must: new shooters may be unfamiliar with fitting earplugs and may not know that muffs require a good seal to be effective
-Allow the new shooter to watch you shoot the gun first. This way they're not surprised when they see a moving parts or a casing ejected
-Everyone is different. Start off with small, light-recoiling "quiet" calibers like the .22 short or LR and move up at the shooter's request. Some people enjoy shooting guns that make a big fireball, but many do not. The last thing you want is to have them flinching and anticipating recoil from the start.
-Make sure your equipment is in proper working order. Nothing is more embarassing to you, or boring for a new shooter, than to have a gun malfunction while trying to become familiar with it. With that said, be sure to cover what to do in such an instance.
Best of luck!