Draft one of your story is like tarnish on your good silverware or your jewelry. There are parts of it that are discolored, or in the case of your story, make no sense, or is in need of more information. Your grammar and spelling may need to be cleaned up as well. That’s what the first draft is: a mess that needs to be fixed. But, hey, you have it down on paper (in an electronic document) right? Right. That’s what counts.
Once you get that first draft done, that’s when it’s time to clean the “tarnish” off and polish it up. So, you go back to the beginning of your story and start reading through it, all the while making notations of changes you might want to make. When that’s done, go back to the beginning once more and make those changes you noted.
Keep going over and over your story like that until it’s the way you want it. Make sure everything makes sense. Lastly, you want to check grammar and spelling and word redundancies. When that’s done, you will have a finely polished story that will shine its brightest.