Patenting Costs article: How much does it cost to get a patent? $5-8k total (US Patent issued), depending on what kind (design or utility), how complex, and in which countries patent protection is sought.
For design and utility patents, the third step to patenting is patent application filing. Patent application filing is the submitting of a complete and properly formatted patent application to the patent office.
The basics on how to start and conduct a prior art or patent search to find out if an invention is novel and non-obvious. By Carson Patents, USPTO Registered Patent Agent, Gregory Carson.