How do you contact manufactures to help you to make a product for the idea you have?

You may get to that point, but you are jumping the gun a little. A lot of work has to be done before a manufacturer will give your idea any time at all. Get some help from people who know how to handle new ideas and inventions. A spectacular idea that ends up have no realistic market at all won't be given a passing glance by people who have money to invest. If I had the money and resources to develop a new idea, I'd want to make sure that the idea will SELL. That's part of what you have to research before talking to the guys with the materials and machinery.