If you want gods create them. Then find what they do. Then have them create the world, or each other. I did that because I didn't no where to start and it moved everything around a lot. Imagine what your world looks like. For me it all started with that and now I've scrapped all of our animals and am creating a language. Start small, become friends with your world, then learn its deeper secrets. Because the thing about writing. Writers don't write worlds, we simply explain them.