The 12-step sales letter template is designed to overcome each of these objections in a careful, methodical series of copywriting tactics. 2. A Product Launch Sales Letter Sample.A sales letter is an important tool for shaping the way customers think of you. The free sample letters provided here can be easily customized for situations where it may be appropriate to send a sales letter. In this article, we provide a stepbystep guide to help you write an effective letter to sell a product with a template, sample and tips. First, write down exactly what you want the letter to do under three key headings: Inform; Sell; Encourage Action. This document provides guidance on writing effective sales letters. Direct mail letters are of various types, such as checklists, quizzes, and samples. Effective sales letters are difficult to write. Learn from the experts.