I have been a NRA LE instructor since 1987. I also started shooting in formal matches as a kid in the 1960s and have been doing that off and on up until about 2 years ago. I keep things simple. You teach: Safety, Use of Force (as it applies), then Fundamentals (sight alignment, trigger control, grip, stance, sight picture, follow through, etc)--in that order. Live fire training is equally straight forward: Known Distance training first until the person demonstrates application of safety and shooting fundamentals and then practical training as it applies to make decisions (shoot-don't shoot, multiple targets, reloading, clearing, etc).
In initial training always safety first and accuracy over speed; that lays a good foundation for anything that follows.