
ohako |
I'm a bit minimalist when it comes to setting up player options. For a given AP it's
Core Rulebook
Advanced Player's Guide (minus the summoner)
one other Player Companion
figuring out the one Player Companion is pretty easy, usually.
Reign of Winter? People of the North
Mummy's Mask? People of the Sands
Iron Gods? People of the River
...
Jade Regent? Varisia, Birthplace of Legends, and maybe the Dragon Empires Primer for a midseason replacement
What's the tie-in product for Carrion Crown?

Ben the Red |

There wasn't one that came out with Carrion Crown as far as I can tell. Paizo was releasing their "Faiths of" series along with "<Race> of Golarion" in 2011. But paizo recently released the Undead Slayer's Handbook, which would be appropriate for Carrion Crown.
There's also the Carrion Crown Player's Guide, which is useful for introducing players to the world and giving them some character ideas (as well as the traits that tie the PCs to the professor).