For most clients we will start your campaigns off with Google, and its pay-per-click product, AdWords. Since Google has about 63% of all U.S. search from homes, offices and universities each month, it is the most strategic place to start. AdWords offers a number of opportunities for our clients and comes complete with a robust analytics program that makes tracking all facets of your campaign very easy and helpful. In addition, Google AdWords tends not to be any more expensive than the same words on Yahoo! Search Marketing or MSN Live. While Google AdWords may be very complicated to administer for high ROI, it is definitely the place to start.
For more information refer to search engine marketing
