A potential client will associate the quality of your logo with how professional your business is. Have your logo professionally designed, make a request in the logo thread here: http://www.nachi.org/inspector-logos.htm
If you need a logo/materials/website quickly, consider the express lane option: http://www.inspectoroutlet.com/express-lane-brochure-and-business-card-package.aspx
Marketing materials - jessica@internachi.org
Website design - inspectorpages.com