In this article, we discuss how to write a business proposal letter and we offer sample letters and templates you can use as a guide. You should only register as a vendor if you have a business relationship with Fulton County Government (e.g., being awarded a contract, purchase order, etc.). We've got a simple 5step process to help you craft your letter. Below, you'll also find 3 unique templates with an example proposal letter for each. First, to begin the letter, start with a warm greeting and mention your sponsor's name. Don't jump right into the letter. Here are a few example proposal letters to inspire you as you create your own. This workshop will provide an overview of the RFP preparation and evaluation processes. Here are a few example proposal letters to inspire you as you create your own.