Well, you can first start with an introductory paragraph of you basically giving brief information about you're story. Then tell whatever you need by visualizing the images in your head just like a movie. Make sure you also add key points in your story such as the rise up to the climax, the climax (main), and finally the solution to the problem and or climax. Then you could end off the story with a strong summarizing conclusion, for example, Happily ever after. If you want you could also search up some of the related stories to guide you through your process.