1. Think of a specific point in your life that the readers might find interesting or from which the readers can draw a valuable lesson
2. Brainstorm. Grab a pen and paper and draw out possible topics that could spring up from your main topic. Recall anecdotes, definitions, people and dates that you can include in the narrative. Do not try to limit yourself when coming up with ideas, for you can always select from the ones you have already thought up.
3. Decide on a structure. Compose an outline for your essay. You can start by laying out the basic facts of the incident, such as the time, the date and the place, or by revealing the conflict then discussing the events that led up to it.
4. Compose a draft. Begin to fill in the facts needed in the essay, following the structure you decided earlier. Since the essay is coming from your point of view, try to intersperse events with personal realizations you may have had as they occurred. Don't worry if your first draft may look and sound raw, because you can always edit it at a later time.
5. Be as detailed and interesting as possible. Since most of the things you are narrating are your own, try to provide careful details so as not to alienate the reader
6. Provide a clear resolution. Make the readers understand the point of your story. An open-ended ending can only render the story pointless, as is simply narrating the day's event like you would in your personal diary. Wrap up loose ends that you may have discussed in preceding paragraphs. Remember, you are telling a story like a novel's author; so make sure all conflicts you have included are resolved.
Quoted from
http://www.howtodothings.com/hobbies/how-to-compose-a-narrative-essay