How do you manufacture your own invention?

Answer 1

First let your thoughts flow free. Second make sure you aren't doing this solely for profit (you've seen all those annoying commercials). Third think it through how will it work. Fourth research your idea make sure you know how to make it work with as little malfunctions as possible. I don't know much more then that make sure you copyright any good ideas.
You cannot copyright inventions and if you did it would provide no protection for the ideas. If they are truly novel and an improvement on existing state of the art you can and should patent them, an entirely different process (Getting an enforceable patent requires hiring a patent attorney to do the search and file the paperwork, while getting an enforceable copyright only requires making sure a correctly worded copyright notice appears on each copy distributed). If you choose not to patent an invention you must keep it a trade secret.

Copyrights only apply to printed works and works of "art" (e.g. music, paintings, computer software, integrated circuit etching masks).

Answer 2

Definitely, get some professional help and input. You may have invented the most wonderful item since sliced bread-- but if there is no market for it, you'll pour your life's savings down the tube.