I have a business idea, I didn't present it to anybody yet, but it involves tech (altough not hightech, it basically exists and is not so hard to figure out). It is a product made of metal and plastic basically. But what concerns me is the manufacturing part. I have no idea where and how to design the metal / plastic parts so that they fit together. I heard about OEM/ODM manufacturers e.g in China, but how do you approach your idea, how does your idea get shape finally? It involves also a small software part, but the basic scaffolding should come first.