The top half of the page shows off the product being sold and has bullet points to list its main features. The buy it now button is also displayed prominently in this section. In the center of the page you can list testimonials from those who have purchased the product and go into more detail about what the product does. Finally, at the bottom of the page you have a subscription box to allow visitors to get updates about the product you’re selling.
If you are planning on releasing a product online such as an eBook, you could save yourself the hassle of getting a custom design made for your sales page and give Sales Lead a try. The home page is widget ready so you should be able to customise the way content is displayed quite easily. It’s free to download so you’ve got nothing to lose :)