All of the scripts that I write are modeled after the format developed by Anne Matava. Some portions of the story are required, and some portions are variables. The variables are meant to be determined by the class. It is so important to the storytelling (storyasking) process that you allow your classes to determine their own details, because the story will be infinitely more engaging because it is personalized!
I spent the better part of my day today writing a way-too-long tutorial on how to use Matava-style scripts to ask a story. I have tried to make it as comprehensive–and comprehensible–as possible, but if you have any further questions or need clarification, please post your concerns in the comments section here so that all of my readers can benefit from them!
Happy reading! Here it is: Matava scripts