Proof reader, ghost writer and general expert guidance needed!

Hi there, I've written a nonfiction book, that is currently 20,000 words. I'd ideally like someone to firstly proof read what I've done, and perhaps make suggestions regarding the flow etc. If that person could also expand on any of the content to take the word count beyond 25,000 that would be amazing. The book is about how most people are often simply winging it in life. The book covers self belief, positive attitude, effort, talent, luck, habits, money and wealth. A general look at how to get the best out of your life by not being afraid of making mistakes and not being afraid to wing it when the need arises.
I'm finding it tricky to stand back and look at the book as a whole to see if it needs more content or if it's lop-sided anywhere. Help appreciated.