Material Allowed:
You may use any Paizo material from the d20PFSRD. As long as I can look it up on that site, and it's not 3rd-party material, you're good to go. Play what's fun for you. HOWEVER! This campaign is set in Greyhawk, so you'll be using the Greyhawk pantheon and cultures instead of the ones from Pathfinder. I will be adding a post in the Character Knowledge section about prominent deities in the region shortly. See below.
Local Deities:
There are four established temples in Cauldron—St. Cuthbert, Pelor, Kord, and Wee Jas. There is a shrine to Fharlanghn, the god of travel at the Lucky Monkey. Additional shrines to Pelor, Wee Jas, Moradin, Yondalla, and Garl Glittergold can be found in the outlying towns and villages. Here are the domains associated with each of the common deities:

Ability Scores:
Use the standard method (4d6 drop lowest) to generate your ability scores, but roll three (3) sets instead of one. You may choose which of the three sets you will use for your character. Please roll your stats in this thread (ideally in one post to keep things clean), and then let me know which of the three sets you'll be using.
Alignment: No evil alignments, please. I'm not down with that. I like my heroes to be heroic. =)
Starting Gold: Take the average amount of starting gold for your class.
Backgrounds:
The campaign works best if your character is from the Cauldron region. You're not required to do this, but I want to encourage it, so: Any character who hails from one of the towns or villages in the region may have a +1 bonus to any one ability score. List this on your character under Special Abilities as "Local Hero ([Name of Town]) - [Stat Modified]" (example: Local Hero (Hollowsky) – +1 Charisma). You can find a list of the towns in the region, along with a brief description of each, in this thread.
Character Sheets:
I will be creating a shared Google drive folder to store our campaign materials. There will be a spot in there for your character sheets, and a fillable PDF template for you to use. Keeping the character sheets there (and in that format) makes it easier for me to keep track of everyone.