What's Your Audience?
A business consultant's first question is "who is your target market?" The answer to that question helps him tailor your ad campaigns to reach the people who are interested in your products and services.
Things aren't any different when it comes to a website. True, you still have to make your site and its content appealing to everybody, however the focus should be on the target market. If your typical customer is a 60 year old male, the color scheme, font sizes, and, most importantly, the lingo will be drastically different from those you'd use if you were selling to a 17 year old teen. Avoid laid back terminology when addressing an older audience (yes, that's right, your viewers are an audience). Pepper the text with kid speak for the teeny bopper crowd.
Spend time to figure out your target market and then grab their attention.