This is an extremely emotional and intimate type of writing. You share a personal experience with your readers in a detailed manner. Your audience should have an opportunity to see the event or person that you’ve written about through your eyes and understand your feelings. Any personal essay has two main aspects: the description of a particular situation and how it has influenced your worldview and life. Generally, the personal essay is the shortest form of autobiographical writing, along with the essay for college.
For example, if you grew up on a farm, you know the difference between the smell of hay and wheat, and certainly that of pig manure and cow manure—because you had to shovel one or all of these at some point. City people probably don’t even know there is a difference. Describing the subtle differences of each and comparing the scents to other scents can help the reader imagine the situation more clearly.
These two sets illustrate how you should show the entire action and then show the entire reaction. Don't mix the two together in one paragraph. Write your entire book in this way — action and reaction, one complete set after another. If one part of the set is missing, readers will sense an awkwardness. If you're writing an autobiography, or anything else, action/reaction sequences will make your writing lively and natural. As you expand your ideas, write in action/reaction pairs.
Review your outline again and imagine that is is a web becoming ever more intricate. Every spider web begins with a single supporting thread that anchors all others. Then the spider lays key connecting threads, to which it attaches many, many smaller lines. Watch an animated video of a web being built. Your initial scenes of obstacles and failure make up the supporting threads to which all others in your story web connect.
“I was born in 19XX year, I entered school N…” Would you read that if you had a choice? Most likely not, especially if you already have read a dozen biographies which star with the same phrase. Yes, an autobiography is a formal piece of writing. But here, it rather means that you are not allowed to use slang and colloquial language, instead of following a specific pattern of writing.
Write out your life timeline. Start writing your autobiography by conducting research on your own life. Creating a timeline of your life is a good way to make sure you include all the most important dates and events, and it gives you a structure to build upon. You can consider this the "brainstorming" phase, so don't hesitate to write down everything you can remember, even if you don't think the memory will make it into the final version of the book.