So I'm writing this story that I've already drawn out and created a plot for, and I've had it for a while now. It's a fantasy/adventure type novel filled with different types of fantastical elements, but I wanted to instill a sense of realism in them as well, to make the story less out of this world and have the characters and elements still in the realm of believable. But as I've been building on that, I can't quite decide whether this story should be set in the real world with all the places on the actual map, or whether I should create the entire world from scratch, and if so, where would I start and why would I name certain places in a certain way? Each present problems. Should I create a whole different world for the characters I feel have too much grounding in reality for a different one than mine, or should I leave the world alone for a story that surpasses it? If you have any suggestions on how I should do this, because it still is a fantasy novel, I would appreciate it.