My expectation is that you’ll play a Sorcerer-King, and by extension, his realm as a whole, but I suppose you could pick any other role if you’d want to, including a sorcerer that isn’t a king or a non-magical character.
If you’re playing a Sorcerer-King, you’ll need to think of a character, as well as the realm he’s ruling over. To keep things simple, I suggest that each realm is either a big city state, or a capital plus a few small settlements. I’d like to avoid having dozens of city names to think about, if you know what I mean.
Character
Name:
Race: Could be anything people are familiar with, or something new. If it’s the latter, you’ll need to describe the race as well.
Gender:
Age:
Appearence:
Personality:
Class & Occupation: Sorcerer-King?
Skills: Things he’s good at. Is he persuasive? Is he athletic? Is he a champion domino player?
Magic: Only if he’s a sorcerer, of course. You don’t need to be very specific here (it might actually be better if you’re not) but I’d like it if you stated some unique flavour to your sorcerer by picking a kind of magic that he’s most apt with (necromancy / elements / psychic / telekinesis / etcetera).
Background: Short background story for your character.
Realm
Name:
Races: Is it a cosmopolitan realm, with many races? Is it just one?
Cities and Settlements: A list of cities/settlements and a short description about them.
Description: Anything else left to say about the realm goes here.