Words mean different things :-) I think the original poster means "product development" here.
If the idea is: "I put this on my chicken coop. When a racoon walks by, the laser points at the racoon, scaring it away" then that's not a product I can currently buy. If that product works, there might be a market for it.
Product development is hard work, and requires lots of small steps to all be completed correctly. If this is the first product you're trying to develop and bring to market, you should try to find a mentor or advisor or partner who has done it before, and listen to what they have to say
. I can't emphasize that enough -- experience can make or break a product development effort.
Typically you'll have to build the prototype and the first "real" instance of the product yourself, using prototyping methods. Anything from sheet metal cutting to 3D printing may help. Once you have a working version that is manufacturable, you can provide drawings, a parts list, and make a request for proposals to find contractors who will assemble it. You're also going to have to solve problems like packaging for transportation, documentation, and regulatory compliance (make sure
you understand the FCC requirements and costs, for example.)
You can create the necessary parts lists and drawings in a tool like Autodesk Inventor, or even just using free programs like Inkscape and Google Spreadsheets. But that requires that you already have a good understanding of how to build the thing.
If what you're asking is "I have this idea for a racoon prevention device, and I need help to have the first one built," then trying to out-source that to a different country is probably not going to work well. In fact, out-sourcing to even another city might be hard, as you'll need to work closely with whomever you pay to make this happen, and frequent in-person check-ups are important to success. Also, you should expect to pay significant money for the actual effort involved in designing, engineering, and prototyping, if that's what you're trying to look for. Prototypers need to eat, pay the rent, and send their kids to school, too