There are three major sections of every script. They include the headings, narration and dialogue. The heading basically explains where the scene is taking place, the time or the camera location. You may not need all of this information, but the more specific you can be, the better your script will be received. The narration portion can be used to describe the character(s) in the scene or stage and sound directions. Finally, the dialogue is the spoken lines each character speaks. Type the name of the speaking character in capital letters centered above the dialogue. You may use emotional instructions in parentheses, but use them sparingly.
Margins are important to proper script presentation. Always set the left margin to 1.5 inches, while the right margin can be left up to the writer. In general, it should be anywhere from a quarter inch to 1.25 inches. The margins above and below each page should be 1 inch. Maintain 2.5 inches from the left of the page for all dialogue. Each page of the script should be about 55 lines long. All page numbers should appear in the upper-right-hand corner, but no page number is necessary on the first page.
If you do not enjoy formatting, consider purchasing a program that does the formatting for you. These programs are generally inexpensive and will save you a great deal of time when preparing the script.
Tension and flow is important to plot development when writing a script. Use dialogue to advance the story before using it to reveal character. One way that screen writers use dialogue to both advance the story and reveal character is called explanation dialogue. With this technique, characters explain how they are handling a situation to another character with natural language. For example, "If we can get the firing codes for the rocket, the Landrey will not be able to bomb the city." In just one sentence, both the desire of the protagonist to foil the antagonist and an important plot device are revealed.
In the same way, avoid using dialogue as filler. Always have something for each character to be doing while talking. By limiting exchanges between characters to one or two lines and keeping the action moving, even somewhat dry dialogue can become interesting.
Avoid blunt character development. In other words, show the reader a character with a soft heart rather than having another character simply state that he "has a soft heart." Scripts should leave a great deal up to interpretation for the reader. Write in a way that could lead one reader to think that your protagonist is good for the sake of being good, while another reader could conclude that the protagonist has an ulterior motive.