How (what are the steps ) in producing a product and selling it?

Venture capitalists invest in fledgling manufacturers - or you could form a small company with some trusted friends (ala Apple - which Gates started in his Garage) First, if you can - make a prototype or some vague drawings (leave out measurements) Show how your product will be superior or new and different and solve a common problem. If your item consists of many parts - the best way to protect is to order parts or submit drawings for one part of your device - you can ask various MFG for costs based on products of Minimum 1,000 pieces. Check the "ThomasRegister.com" for manufacturers of various items.