Learn how to build things, everything using simple tools. Unless your rich or extraordinarily lucky, you will have difficulty launching any product that you can not build with your own two hands (and a dremel tool). Investors, companies, and business partners have all seen thousands of inventors with ideas but absolutely no clue how to build them. By showing them a working prototype or even a detailed mock up you will have one step above most other "inventors" . If you can develop a clear model in your head and and then build it with your hands, then a manufacturer will be able to do the same.