Really it doesn't have much more than what the instructions say. Basically it is broken down like this:
It opens up with Regular or story mode
Story mode has Sagas in it. These are big overarching bookcovers that have various stories in them. Each story has various chapters that are the battles/cutscenes. You can set it up so that certain chapters/stories/sagas/characters/stages are locked. They are unlocked by triggers.
For example if you set up a Saga, with 2 stories each made of 3 chapters. You complete Story 1, Chapter 1 and set it to unlock trigger 1. Trigger 1 being 'on' causes S1 Chapter 2 to unlock, and that being done can do trigger 2, which unlocks chapter 3, etc.
New characters and staged are unlocked the same way be 'unlocking' a new version of the select.def which includes the new stuff.
How to do this is covered pretty simply in the instructions and in the programs used to make the stories.
