Ghost Write Motivational Autobiography

I am writing a book about my life, I am working from both memory and social services records. I aim the book to be inspirational to help others in similar circumstances to overcome the obstacles that they either face or imagine that they face. My aim is for the book to be a cross between self-help and autobiographical. I have recently started my business and haven't got the spare time to sit and write it. I am happy to negotiate either per hour ghost writing or as a share of the book sales.