USPTO.gov is the site for the United States Patent and Trademark Office. The Trademark portion of the site has a boolean search tool for searching registered, pending, and abandoned trademarks. The tool is not the most user friendly system, but if you can ask a question on lawyers.com, you can probably make use of that search tool. That site also allows you to file a US trademark application online.
If you are not comfortable doing either, you can hire a trademark attorney. We typically charge $500 for a basic search and $850 for filing the trademark application (that fee includes the government fee). You might find someone closer to you who can do the work a little cheaper, but those numbers provide a baseline for thinking about what might be reasonable to expect.
Good luck,
Todd
Answered on Feb 10th, 2014 at 8:52 AM