How do I go about writing an autobiography? like how do I get all the info organized ?

How do I organize and prepare to actually start writing so I can make chapters about specific topics and have the book setup so its not just a bunch of random thoughts and stories. So it will actually make sence and be understandable. My life is and always has been filled with crazy out of the ordanary adventures and situations and I feel I should doent it but I'm horrable at writing and anything like that. PLEASE HELP!