Delivering the correct information to your customer is also a very good way of impressing him and making sure that he won't click away to another site but actually make the purchase from your owns. If you want to capture your visitor's interest and curiosity, use a custom landing page or even a Sales video and make sure you make use of some smart but true slogans.
A good marketer will understand and will try to adapt to this as quickly as he can. Try not to focus only on the content of the site but on the actual design as well. A visitor who's on the look-out for any type of product will most likely buy it from a site that inspires him confidence so make sure that your site doesn't look cheap and made in a hurry.
Also, do not overlook the little details as people will tend to notice them as well. These can be a serious factor in your customer eyes when it comes to deciding whether he should spend the cash or not. Simple and minimalist is the way to go and also make sure the site is easy to use.
Make no mistake, visitors will observe anything so make sure you turn that into your favor and pay attention to the details of the website. Make your site as simple and clean possible and also make sure it's easy to navigate.
The internet has many templates that you can download and personalize to fit your needs. Or if your site runs on wordpress make sure to check out the plugins that they have.