If anyone else writing in Terramagne has experience with other locations that I haven't detailed yet in my own writing, it's okay to set things in your own backyard. Ask me if you want to do that. I have a ton of notes for background material and some of that stuff relates to things outside America. I even have some characters who haven't been deployed yet, some of them foreign. I can give you whatever I've got on your locale, and help figure out how it fits with what I've been doing. I have the complete list of top-ten and bottom-ten countries for soups; everything else is somewhere in the middle.
EDIT 2/11/16: thnidu adds the recommendation that if you are writing about an unfamiliar place, try to find a native who is willing to check your work for accuracy of local details. I do this when I can, like inviting my Aussie fans to suggest problems for the Spectrum down under.