Needing someone to write a book about a kids/teenagers Toy

This is a very popular toy specially for boys age between 9-14. They can ride it. This book needs to explain about how to use this device, safety instructions, tips and tricks and how to do those tricks. This book needs illustrations for showing how to do those tricks. I dont expect writer to illustrate for me. The main reason of this project is content, I might work on illustrations but if you can come up with a solution for those illustrations I am happy to hear that. Illustrations could be something like all sport equipments manuals. Something simple. Writer needs to work on content and indicates what kind of illustration each section needs. Book should be easy for kids to read and follow the instructions. I am thinking about 100-150 pages. I need a VERY knowledgeable writer that can write proper instructions. It must be a complete and good book . for publish paper back and ebook use. Need to sign a NDA , so that I own the rights copyrights. Contents should pass copyscape tests. I will provide some sample content/video and research that I have done. payments are done via paypal.