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.