Some bits of your website’s content are more important than others; that’s just a fact. The “Buy Now” button is almost certainly more important than the entire “About Us” page, and you need to direct the user’s focus accordingly, if you really want that sale. That’s why we’re here: you might call this the newbie’s guide to controlling focus.
You’re going to have build your site in such a way that the eye is naturally drawn from one step to the next.
My sister used to accomplish controlling my focus by sternly, but calmly, telling me to “Get back to your schoolwork” anywhere from fifteen to forty times in a single day. But your users aren’t going to put on some music and “buckle down” to finish browsing your website, they need to be drawn in.