I didn't have a WIP map yet, but I had been toying with the idea of just making it a fantasy version of Earth so that we could use Google Maps for travel times and geography and stuff and then use real-world mythologies and kingdoms to an extent. Greek Gods, Norse Gods, Egyptian Gods, etc. As for the nations, I was thinking of things like a version of the Roman Empire that is modeled after the Targaryens in Old Valyria and has Dragonborn citizens as the ruling elite; Scotland as a Dwarf kingdom; Ireland as a Wood Elf kingdom with Druids as the ruling class; England and Wales as joint High Elf/Human kingdoms; America as an open land with the different states belonging to different races (Humans control the New England states, Elves control the Pacific Northwest, Dwarves control the Rocky Mountains, etc); Humans, Dwarves, Half-Orcs, and Goliaths control Scandinavia with Barbarians/Vikings as the ruling class; Half-Giant Fighters and Barbarians control Sparta, etc. 

Since I won't be very involved in the RP (if at all), it's up to you guys what you want to do, but if you want to go the route mentioned above, I will at least flesh out the world and the lore some to help you guys out. I can also still write the intro post where everyone ends up in the new world.