Session Zero Checklist for Starting a New Campaign
Exhaustive list of Table Rules you may want to review with your players
Edited version of Table Rules for Online D&D Groups
Session Zero Handout - Shows the DM what kind of players they have. Includes space to write character info.
[Reddit] The Complete Hippo - great for worldbuilding
Sly Flourish Tips for New Dungeon Masters
Sly Flourish Article Archive (Use ctrl-f to find stuff)
Lithyscaphe - DMing in old-school style