The time, era, etc.
It's going to be homebrew, with the same basic dieties.
I'm going to say... semi-modern. Meaning... You can have Muskets, but I wouldn't advise it. They'll be one-shot weapons. I'll say they deal 3d6 damage, but takes quite a while to reload. Say... two rounds, to balance it out.
There will be four main lands. Plaeg, Tundra, Chivel (Pronounced like the band Chevelle), and Chilindriate. Plaeg is mostly Evil aligned, Tundra is mostly Chaotic aligned, Chivel is mostly Good aligned, and Chilindriate is mostly Lawful aligned.
Types of people you'd likely see in each.
Plaeg: Sorcerers, Necromancers, Clerics, Rogues, Wizards
Tundra: Sorcerers, Bards, Rogues, Clerics, Barbarians, Fighters
Chivel: Wizards, Sorcerers, Clerics, Bards, Fighters
Chilindriate: Knights, Samurai, Clerics, Fighters, Wizards
If you need anymore information, ask me.