Already working on one, for about almost a decade. Technically just six years, but still.
The Legend of Ertar
After the three books, I'm hoping Telltale would make a deal to make an episodic game out of five of the Stories of Ertar
series. After that, I'll probably be working on either a new series set in the same world as the (planned) GameDude comic series, which is supposed to be a comedy movie series.
After that, I *might* write Ertar 2.0, and I'll be searching for the internet for fanfics that could fit in canon to make them officially part of the canon. Not that I'll be rewriting their stories, I'll just keep a list of stories I'll consider canon.
But that's my long term plan. Short term plan is to actually get the friggen first part of the story done.