As a freelance script writer, your duties vary somewhat depending on the needs of your clients, though for the most part you focus on the writing and editing of scripts for video productions. You can write and pitch a screenplay to an agent, who will attempt to sell it to a film production studio, television studio, or other media production company. Some clients hire freelance script writers to help improve existing scripts as part of a writing team, while advertising agencies and commercial production companies hire scriptwriters to create the scripts for video or audio advertising. If a studio or producer hires you or accepts your script pitch, you work on the project on a contract basis.