Sell something for me

I am a retired brain injury lawyer in the UK and have completed the writing of an easy to read book on neurorehabilitation, with a foreword by an eminent Professor of Neurology. It is couched in very simple and easy to understand language designed to be read by the millions of people (victims and their friends and family as well as professionals) around the world who are affected by brain injury each year. It is a "How to..." book and contains lots of help and tips. I have a UK publisher who has contracted with me to publish the book. In addition to the "How to..." help and handy tips for understanding and coping with the aftermath of brain injury, the book will also carry appropriate messages from premium sponsors as well as contain a directory of other service providers wishing to promote their services. The book will be released geographically to optimise available sponsorship/advertising in different countries around the world (so, UK sponsors will not feature in the USA or Australian, or China, or wherever, edition, etc etc). I need a freelancer to assist me with identifying and optimising sponsorship/promotional/advertising clients and revenue around the world. I envisage a commission payable on sales arrangement. I have no settled idea about quantum of the potential revenue or even the value of the individual sponsorship/promotional opportunity to the premium sponsors/promoters, so I may need guidance on this. This is not a "ready to go" project. It needs a campaign designing, on a payment by results basis, so this may only be attractive to a freelancer who can see the potential here. My publisher is presently designing a sales pack, and dedicated simple web site to assist the sales and promotion project.