I have written a tutorial for creating scenarios. It's not really perfect, but i think it could be a good starting point for new scenario authors. The last part Tips for testing coroutines is missing right now, but i want to hear some opinions about the general approach.
I am also asking here for proofreading and a feedback, especially i would be glad if a beginner can check the tutorial for understandability. This is a wiki article, so don't hesitate to make appropriate changes
Here is the Scenario Tutorial