First off - if you don't have a website, you had better get one. It's an important part of your business and it's a major tool in allowing your customers to find you.
Also, while it's tempting to have your nephew/college student build a quickie site, don't. There is a lot more to it than throwing up some pages. Here's a hint: it's not about having the prettiest site.
You don't need to spend a fortune on bells and whistles, but you do need solid basics - a clean, benefits-driven site that drives sales leads, rather than serves as just an expensive brochure. Folks need to be able to find you through search engines and Google Maps. You need an easy-to-read site with lots of authoritative content and plenty of ways for people to get in touch with you. Also, your site needs to work well on mobile devices.
If you already have a site, make sure it has the basics well-covered and is easy to update and operate.