BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
Star Wars Episode I: I Am a Jedi is a children's book written by Marc Cerasini with interior design by Iain Morris. The book is told from Qui-Gon Jinn's point of view in 32 BBY, then switches over to Obi-Wan Kenobi's perspective at the very end.
My name is Qui-Gon Jinn. I am a Jedi. The Jedi are guardians of peace in the universe. We draw our strength from a mysterious power called the Force. I would be honored to tell you more. Just open this book and I will begin.