I'm about eight sessions into my first campaign of Apocalypse World. On Story Games, Paul B just asked for "best practices" and I wrote up the following that I've been thinking about lately. These summarize the things I've learned, from the mistakes I've made and the things that weren't clear to me in the book without having played it a few times. Also some things I've picked up from you all. The next game I run will be a better one because of these.
- Ask more questions. The book tells you to ask questions and give the players room to answer. I wish I'd done this more. GMing impulses and traditional authority setups will leave people looking to you to fill in setting details, and your impulse will be to do that. Look for more opportunities to have the players fill in those gaps rather than doing it yourself. Do this as much as possible.
- Make all NPCs Threats. After the first game you'll have a bunch of NPCs. They all need to be Threats. Do not handwave this. If you're like, "Well, they don't seem to belong to any of these Threat types," either make them a member of a Warlord's cast and make the Warlord the Threat, make them a Brute and figure out a larger group that the NPC belongs to that's a Threat. After every game when an NPC is introduced, go through after the game and make sure they are Threats.
- Wait. Make everything a Threat. Think about all aspects of your world as threats. The town the PCs live in? Landscape threat. That religious belief that came up in play? That's an Affliction - Delusion. The strange characters that populate the Psychic Maelstrom? Threat. The Psychic Maelstrom? That's a Threat too.
- Fill out the world with your Fronts. Different people have different numbers of Fronts that work for them. I generally have three - one that's fully manifesting, one that's being hinted at, and one in the back of the fridge. In each Front you're supposed to have four Threats. To begin with you'll maybe only be able to stick one or two existing Threats in there, so make sure to fill it out with two or three Threats that you've made up. Spin up a Warlord nearby, a Grotesque lurking in the town tht nobody realizes, etc. Once you've been playing for a bit though and if you follow the last two steps, you'll have more than enough Threats. Still, leave maybe one spot in each Front open to introduce something new.