Start with character development. The easiest place to begin with children is to show them how to develop a character. Offer them guidance in showing character traits such as physical characteristics, personality and qualities that they like. Asking them to draw out their character or list the qualities will help them see a concrete description of who they imagine.
Define the different types of character. After the main character is developed, you can begin to teach the children how to develop the characters that are secondary. This includes defining the friends of the character as well as the enemies of the character. This will provide a full picture of who will be in the play.
Set the scene. It is easiest to begin with the first scene and some of the background that is in that scene. This provides children with a way of making the entire piece of writing more concrete and will let them begin to visualize what is happening.
Show what happens. When you have set the first scene, combine the main character and some of the secondary characters with the scene that is currently in place. Define this first scene as stating a problem among the characters so that the rest of the play can be developed. This should be combined with actions that each of the characters take. Make sure to define how to write these actions into the correct places. Teach the children how to write in the different names to show who is talking and when they are talking.
Set the next scene. After the foundation of the play has been established, you can set up the next scene and go to the next part of the character development. Show the children how to continue doing this until they have written the entire script with a complete resolution.