The Fox thriller stars Kevin Bacon as FBI agent Ryan Hardy and James Purefoy as his serial killer nemesis Joe Carroll.
"I have this [first] season pretty much worked out and next season, because I know how big we're gonna get," Williamson told IGN.
"Once you see the pilot, you'll actually understand... that it actually kind of writes itself in terms of the framework of the first season. The serial killer lays it all out.
"And so the first season will be watching that happen, and then we'll watch how our FBI team and Kevin Bacon's character has to constantly stay one step ahead of him."
Williamson went on to compare The Following to Kiefer Sutherland drama 24, as Fox president Kevin Reilly did last month.
"The fun of 24 was Kiefer Sutherland always had a problem to solve, and that's the same here," he explained. "They just have to stop it before one more person dies. And unfortunately... a lot of people are going to die."
The writer also discussed hiring Apollo 13 star Bacon to play the lead role, admitting that The Following was "right up his alley".
"I think he was drawn to this kind of material," explained Williamson. "He likes this type of TV. He likes the thrillers, he likes the roller coaster ride."
The Following will air on Mondays at midseason, replacing fall drama The Mob Doctor.
