While preparing for my first romp at Dungeon Mastering, a resource I really appreciated was Episode 12 of Critical Role from Geek and Sundry’s twitch channel.
Matt Mercer has been DMing this same group of performers (most of them are voice actors, which makes the characters really awesome) for a long time. Critical Role is normally the group’s weekly DnD game, but episode 12 are tips and tricks on how to run your own game and get new characters started. The DMing advice really starts at 42 minutes in and lasts about an hour, but you can see the whole video here:
Alex Gustafson 