One thing you will learned from top marketers is to write your sales copy first before writing your info-product or creating your product.
If you were to hire a professional copywriter to write a sales letter for your project, you’d expect to pay $ thousands, depending on the copywriter.
But, I can show you where to get an e-book that will teach you how to do it, and it only charge you as low as $2.99. Just search for "Writing Webcopy" at TripleClick.com, you'll get some choices. :)