The best tip I can share with you when it comes to "how to write an autobiography" is pick up a pen and start writing. There is an old german proverb "Begin to weave and God will give you the thread." The more you write the more you will find to write about. Pour out your memories onto the page, don't think about sentence structure, the perfect story or what people are going to think about you when they eventually read it, there will be time to fine tune your work later.... you may even have the privilege of being edited by a professional. It's not about the words it's about the story, what do you have to share with the world. I have compiled a brief collection of excellent articles and free ebooks to help you get started.