Short film scripts usually run 40 pages and feature length films usually fall between 60 to 120 pages. A good rule of thumb is one script page equals approximately one minute of screen time. Scripts do not have to adhere to these lengths, but for beginning writers it is helpful to set a goal for the approximate length.
Use short descriptions of characters, sites and action. A script writer may describe a character with a sentence or even a few words, while a location might be described as a "well-lit country home." Long descriptions hinder the flow and rhythm of a script.
When you introduce a new prop or object in your script, you should always highlight that object with capitalization. This will help point out important props if and when the film goes into production.
Always inform the reader when a character or action changes to a different location. Do not assume the reader knows where and when your scene or scenes are taking place.
As of 2010, Final Draft is a popular program for writing movie scripts. Another program, Movie Maker, is recommended by the Writer's Guild of America. The software correctly puts the outline of the script in the style the industry expects. Using script software also allows you to print secure script files that help protect your work.