Thank you for the response. I'd like to be able to just draw rough sketches of the story / progression. Would I need to share and document planning-process as a dev-blog? 

Sorry for the flurry of questions! I'd like to also plan the code/components on a kanban board - is that acceptable? I am very new to Unity (but not programming) and I figured if I could just get everything visible, I can also figure out the relevant Unity components I need to learn.