Zappo
Explorer
The way I see it, you have two ways to make a homebrew world. You can proceed from large scale to small scale or vice versa.
In either case, you must decide the "core ethos sentence". The flavor. That, and a few other details as well. Pick up WotC's contest submission form, it's a good start. Fill it out. And try and keep it to a page; it won't give you a 1/10000 chance of being published, but it will force you to identify and underline the most important elements of your setting.
Now, you have the choice.
You can write down the world's history, large-scale map, political and economical information for all major countries, descriptions of all major religions and races, as well as maps and info on each major city.
Or, you can describe to the last building and last NPC the small village where the PCs start from and its surroundings, and detail whatever area the PCs blunder in afterwards in the same fashion, leaving the big picture undefined save for legends or tales.
Both are viable; the first is more work, probably too much, but it makes it easier later (more consistancy, no sudden lack of info due to the PCs having gone the wrong way, leaves room for change at the small detail level). The second is easier to start but it'll take some skills later (consistancy is tougher, you may have troubles if the PCs go off the parts you make, and the number of notes grows constantly).
In either case, you must decide the "core ethos sentence". The flavor. That, and a few other details as well. Pick up WotC's contest submission form, it's a good start. Fill it out. And try and keep it to a page; it won't give you a 1/10000 chance of being published, but it will force you to identify and underline the most important elements of your setting.
Now, you have the choice.
You can write down the world's history, large-scale map, political and economical information for all major countries, descriptions of all major religions and races, as well as maps and info on each major city.
Or, you can describe to the last building and last NPC the small village where the PCs start from and its surroundings, and detail whatever area the PCs blunder in afterwards in the same fashion, leaving the big picture undefined save for legends or tales.
Both are viable; the first is more work, probably too much, but it makes it easier later (more consistancy, no sudden lack of info due to the PCs having gone the wrong way, leaves room for change at the small detail level). The second is easier to start but it'll take some skills later (consistancy is tougher, you may have troubles if the PCs go off the parts you make, and the number of notes grows constantly).