No! The first step is to go to the USPTO (patent and trademark office) and search to see if your idea has already been patented. Or you can pay someone else to do the search for you. Be prepared to learn lawyer-ese because the text in patents is written to be difficult to understand.
US Patents typically cost from $4000 to $8,000 or more each.
Yep, What Stored Energy said but I paid with fees and someone else to do the search, license, legal fees, drawings and description, etc $10,000.00 in 1995? But there are two types of patents. Depends on if your idea is mechanical or design. Then you have to pay to keep up the patent. I think mine is 59550**. A design patent is cheaper, but less protection. Also, that's just for the USA and not worldwide on the patent protection. You can pay more and have it protected in other countries too.