Take note of the characteristics of the specific group that you will be writing the skit for. Note the age range and number of children. This will help you to write content suited to the group.
Make a point form list of the plot elements that you would like to include in the skit. The plot should be relatively simple and to the point, as skits are short plays. Write down how you would like the story to begin, the central issue that will reside in the middle of the play, and how it will be resolved at the end.
Create a list of characters. There should be one character for each student to play, unless you intend to have some students doing behind the scenes work.
Write one to two paragraphs detailing the events of the skit, along with each character's role. This will materialize the skit, and allow you to fit each character in to the content.
Type up the script line by line, in a word processing program. Use your paragraphs as a guide, expanding on dialogue as you go. Each line should contain the character's name, followed by a space and the line of dialogue.
Add in narrations where needed, in order to fill in backstories and set scenes. For example, you can add a narration to the beginning of the skit, having a student describe the location, and how the characters know each other.
Detail any actions and expressions that are to be made within the play. For example, if one character is yelling at another, place the words "waving arms" or "storms off" in brackets next to the particular line of dialogue. This will help children to immerse themselves in the play.
Write in points of entry and exit for each character. For example, you can write "Sam enters room" at the point of the play where a character enters a scene. This will help the children to organize themselves throughout the duration of the skit.
Print out one copy of the skit for each student.