How to make a buy now page?

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Do you know the software or programs like fret2fret and survey companies, and ebooks and lots of products that always come in a long page that explains everything you get with testimonials and everything to convince you that they're product is worth buying? How can I create such a page? I'm looking forward to write an ebook with a partner of mine and I want to know how to market it, I believe that pages like this is the way to go and I was wondering how to make one of those pages? Is there a specialized software to make a "buy now" page?