In this guide, we'll walk through some best practices and tips for understanding and responding to Hennepin. County RFPs effectively.We share an example of a letter to send to the City about your new business. When you plan to open a new business, you must notify: Find information about contracting with Hennepin County, including processes, forms, and diversity rules for goods and biddable services. 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. The Bidding Requirements consist of the Invitation to Bid, Instructions to Bidders,. A written plan for launching and operating your business is essential to your success.