The story that I'm trying to write at the moment is going to be a post-apocalyptic type of story. The universe was ripped in half by a sort of weapon. As a result the world is deteriorating and the laws of nature are able to be bent if not completely broken. This poses the question; What sort of things should I consider while I get the setting ready? More importantly; What would be considered believable? What wouldn't? I also feel that maybe I should get the plot developed before I make decisions on this. What do you think?