Pull out the best stories. The story of your entire life would start to get pretty long-winded, so you'll have to make some decisions about what anecdotes you're going to include. Begin drafting your manuscript by writing out the main stories that will be woven together to create a picture of your life. There are a few main topics that most autobiographies cover since readers find them fascinating.
The people you meet who affect your life, and the success and downfalls you experience help to create who you become. Even the bad experiences can be learned from. In fact, they are probably the most poignant and important ones. If someone hurts you, betrays you, or breaks your heart, forgive them, for they have helped you learn about trust and the importance of being cautious when you open your heart. If someone loves you, love them back unconditionally, not only because they love you, but because in a way, they are teaching you to love and how to open your heart and eyes to things.
Develop a central theme, main idea or thesis that clearly explains the purpose behind your autobiography. For example, your theme might be about how you overcame obstacles to become a stronger person, or it might explain why a particular passion -- such as mountain climbing or rescuing animals -- is so important to you. Back your theme with details and background information about your life experiences. For example, you might explain that your dad is in the military, so you've had to learn how to adapt quickly to new schools and unfamiliar environments. Or, you might discuss what it was like growing up in a poor, single-parent home, but how your family was always willing to take in injured or stray pets.