Well, the concept apply to all industries. Advertise!
You need to get some advertisments in your local papers, directories, yearbooks, etc. Make some flyers and pass them out to local business'. Write a letter about your services and personally address it to local business.
You also need to promote your Web Site so people can find it easily.
Another way to get clients is to offer a company with an outdated Web Site a new, and improved, Web Site. This is done via a Web Site proposal.