Designing a website that works means two things:
... in that order. That may seem surprising—after all, it's the client who's paying for the site—but getting people to buy your wares means making it easy for them to do so. You, the website owner, may want a lot of bells and whistles, but don't let frills get in the way of a sale.
Site design is much, much more than just "looking good." It's about usability. I put myself in the position of someone totally ignorant of the client's business (and often, it's not acting!). Can I find what I need to know quickly, without getting lost in the site, or being forced to click the 'Back' button to get where I need to go?
It's been shown by dozens of usability studies that the average website has
about eight seconds of a visitor's attention. If she doesn't find what she
wants by then, it's "bye-bye."
Is there a reason to use your services rather than someone else's? What is your "USP" (Unique Selling Proposition) that makes a visitor want to buy, or at least stay and visit the site a while? You can't convert every visitor into a customer, but you can improve the odds with smart design and useful content.