Start with 1 game, in one place. Don’t worry about ALL the “why’s” or all the places they might go. Let the PCs help guide its build out. Allow them to draw maps and open the doors as they find them. RECORD the sessions and make notes after to build toward consistency. HAVE FUN!
— Ruty at @GaryCon (@RutyWoot) March 3, 2018
Would you recommend starting with a few key notes and then build from their. I would say do a little prep building some locations/NPCs/Encounters to have in your pocket to fill in those “doors” the players open as they progress (& for your own comfort), and plug them in when the story makes it seem natural. Then, expand forward with your post-game notes!
— Matthew Mercer (@matthewmercer) March 3, 2018