A. C. Crispin proposed a book series dealing with Leia Organa that was to be set between Episode III and IV, but "Lucasfilm didn't approve the idea of a Leia backstory because they want to keep that era of the SW continuity untouched for the television series they're considering." Karen Traviss was to write a novel involving Boba Fett, but the project was reportedly canceled because of possible conflicts with the TV series.

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According to Dan Wasson, project leader for the Wii version of the Star Wars: The Force Unleashed video game, the TV series may contain elements from the overall Star Wars: The Force Unleashed multimedia project. In 2014, Stephen Scaia revealed in his Kickstarter campaign that he had been a writer for the series, and was involved in several story elements, including Lando Calrissian losing the Millennium Falcon to Han Solo, Solo and Chewbacca's first meeting, as well as an action scene with Boba Fett.

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Writers from Battlestar Galactica, Heroes, and Lost, as well as those from the Star Wars books and comics, were considered as part of the final interview process in late 2007. In the end, six writers were hired—including Louise Fox, Tony McNamara, Fiona Seres, Matthew Graham, Ronald D. Moore, and Stephen Scaia—and were expected to start work in November 2007. Former Doctor Who writer Russell T Davies was asked to write for the show, but turned it down due to his desire to do his own projects in a different style to both franchises; however, he did claim to be jealous of whoever ended up being hired.

After the writers were hired, story outlines took shape over the next three months. McCallum expected the first writing conference to occur in late 2007, and sessions had began by August 2008. The writers worked closely with the art department (including concept artist Erik Tiemens), which had been working to design sets, environments, vehicles and aliens since 2007. Ronald D. Moore commented on the writing process: "The scripts were written as if money was no object. George was like, 'Don't worry about it.' [Producer Rick McCallum] would groan and put his head in his hands periodically. So for us it was like, 'Okay, f–k it, let's write whatever we want.'" In the end, fifty hours worth of episodes plus a "movie-of-the-week" were written.