Lots of designers don't seem to understand is that there's a big difference between the kind of design you should use if you're trying to present information (usually with ads), and the kind of design you should use if the aim of your website is to make sales. This distinction causes a lot of confusion, bad design, and, ultimately, lost sales. If you're trying to sell, then there's a whole other set of design principles that you need to follow.

The Headline is Everything.

If you want your website to make sales for you, then the first thing you need to pay attention to is the headline on your sales page. It needs to be large, to stand out, and to grab the visitors' attention. It should give a clear benefit (not a feature) of your product that you think would appeal to most people. If you have a bad headline then people won't even look at the rest of what you've written they'll just press the back button.

Always Be Ready to Make the Sale.

As soon as a visitor gets to your product's page, it should be absolutely crystal clear what they've got to do to buy the product. If it's a long page, then 'buy' buttons should be scattered throughout. If a visitor could look at any part of your page and wonder where they have to click to buy the product, then there's something fundamentally wrong with your website's design.

Make Happy Customers Prominent.

On a sales page you should have a space for feedback that has been left by previous customers, whether it's in the form of reviews or testimonials. This gives people an opportunity to read a supposedly objective view of your product, and makes them feel better about spending their money on it. Of course, this means that you need to solicit feedback from previous customers to put in that space a good way of doing this is to offer rewards for customers who contribute in this way.

Pay Attention to Payment.

You need to make sure that your payment page that is, the page where you collect credit card details is well laid out and easy to use. Doing things like making it difficult to type in a credit card number or making it confusing to choose what kind of card you have is likely to damage the customer's confidence in you and your website. This page should be professional and standard don't be tempted to do anything unusual with it.