Use 12-point Courier font
Set 1-inch margins on all sides
Place the scene heading at the left margin in uppercase
Format scene headings as INT. or EXT. followed by location and time of day
Indent action lines to the left margin and keep them concise
Write character names in uppercase and centered above dialogue
Indent dialogue beneath the character name
Use parentheticals sparingly under character names when needed
Format transitions in uppercase and align them to the right margin
Use slug lines to mark each new scene
Keep action in present tense
Write only what can be seen or heard
Use one blank line between elements as needed for readability
Number pages in the top right corner
Start each new scene on a new line
Use standard screenplay spacing and indentation throughout
Keep the screenplay between 90 and 120 pages for a feature-length script