My advice is that if you want to create a story of your own, make sure its a subject you love. If you love the world, characters, plots, ext. of your story, you are putting more enjoyment into it. There is a quote by Steven King that I always liked, "If there's no joy, it is no good." So if you write a story about something you don't like or you just aren't into, the readers can see it in the tone of the story. When I write my stories, I find myself so caught up in my worlds and characters that I have the same kind of enjoyment I feel when I'm playing a video game or watching a movie. So yeah, remember to have fun when you write!