When Should You Make a Map for Your Project?

If someone is starting a new project on whatever type of media they're doing it for I guess what would our opinions be like what would we encourage if they are making a map. At what point in the process do you start building things first to fill the map with or do you build the map and fill them in? That's a really really great question so I've done this in two different directions  when I first first created you know the realms vuqador I had just the region they were in created and I kind of created this stuff as you wentKind of went with that you know Age of Empires fog of war kind of thing he said.