It might be tempting to start your story with "I was born in Dayton, Ohio...," but that is not really where your story begins. It's better to start with an experience. You may wish to start with something like why you were born where you were and how your family's experience led to your birth. If your narrative centers more around a pivotal moment in your life, give the reader a glimpse into that moment. Think about how your favorite movie or novel begins, and look for inspiration from other stories when thinking about how to start your own.
I have lead a very full and sometimes complicated life. I have worked in many different vocations and participated in most all of the arts. I have been ask probably 100s of times why I don’t write a book about my life and or experiences. I realize that aspects of my life are things that should maybe written down for prosperity, but when I begin to think about what to write about, or what area to write about, I am bewildered. To fully write my life would take me volumes of words. I can remember from the age of two until now and yesterday I turned 76. At times I think of things that I think are important, but then other times I think of dozens of things are important. Many of my learned friends call “The Renaissance Man”. I am at a loss.
Create an outline or a graphic organizer of the major topics and ideas you want to cover. For example, you might make a time-order chart -- a chart with event blocks to organize events chronologically. Or, you might draw a cluster web -- a diagram with connected circles -- to divide your autobiography into sections, such as one for relevant background information, one for life-changing events, one for special memories and one for goals and dreams. Focus on reasons why specific events, situations and circumstances were important to you and how they made you feel.