I need someone to promote a diet book which I am about to publish on Kindle

My book is ready to publish. I'd like someone to read it and make any comments which could improve it for the reader. Then when it is available to the public I would like you to market it to the world using all forms of social media. I will pay 100 GBP to the person I choose with 50 up front and 50 after another 2 weeks as we see how we are doing. If we are making progress I would be happy to arrange further payments as agreed between you and me. I am very easy to work for so it won't be a problem. I have published other books before on Kindle and my most successful has sold around 5000 without any marketing at all, although it was over several years. Please give details of your experience with social media marketing - although if you have none but you think you have great ideas and lots of contacts don't be put off from applying! I have uploaded the cover of the book with this post. Thank you for looking. Jon