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.
Patent Prosecution Services are usually one of these three activities:  representing a patent application through examination (responding to office actions),  appealing an examination decision, or  conducting opposition, reissue, or reexamination proceedings.
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.