I'm writing a story, and it's based in a fantasy world (but it never actually says the name of the planet or anything). The town names are made up, though, and so is basically everything else. It's based in a time similar to the middle ages. What i'm trying to do is create the world so that it sounds real. How do i make a completely made up place take on real-life characteristics? and how do I make the characters react to this environment?