Detailed instructions are included in the complete packet for each type of filing. For debit or credit card payments please include an ePayment Checklist.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. It will include a complete analysis of the business structure including: management, personnel, and outside business services and advisors. Instantly draft and send a business proposal template to establish the terms and conditions between your business and clients. Problem Statement: Clearly define the problem or need that your proposal addresses. What should you include in a proposal for services? What should you include in a proposal for services? Click the PDF View link above to see more. OSP prefers electronic signatures.