Hi!
I am an experienced game designer and writer, who currently acts as Creative Director for my own Indie Dev Studio. I have crafted and developed all documentation relevant to the development of a game, from the Concept Piece to the Game Design Document, plus docs like Story Bibles and Scripts.
If required I can send you some example documents that I have completed for my own projects, I would just need an email address to send too.
Let me know if you have any questions regarding my experience or abilities, and I would be more than happy to help.
Kind Regards
Callum Munro