Developing the game world

 Well, I know we'll be starting the campaign in the City of Langwon.

That simplifies things somewhat as far as staring the campaign. Granted, I can't map out an entire city at this point, but I don't need to. I just need some locations and NPCs. I have drawn a rough "continent" and placed Langwon on it. I know where the elves, dwarves, and halflings come from. I know where some mountains are. I know where there are some major rivers, and the Necromancer's Isle. 

As I did with my Traveller campaign I'm starting small and we'll expand knowledge of the setting as we go. 

Intro

In another dimension, on another Earth, on the coast of the Eastern Sea, exists Langwon, a massive city of magic, joy, decadence, wealth, and most of all adventure.

You are a human, elf, half-elf, dwarf, or an out-of-place halfling just come of age and seeking your fortune. Are you a barbarian from the arctic mountains seeking work? Apprentice to a local wizard and prone to trouble? An elf bard, born in the city who's never seen the forest? Young priest from the Temple of the Source? Or a good-natured fast-talking rogue with a larcenous streak? No matter. Langwon offers opportunities for the bold and resourceful.