Start by creating a document that outlines the customer, the product or service being sold, and the details of the sale. Include the customer's name, address, contact information, and any other relevant details that may be needed. 2. Describe the product or service that was sold. Include any relevant details such as the size, color, model number, and any special features or benefits. 3. List the price of the sale. Make sure to include any discounts or special pricing agreements that may have been negotiated. 4. Record any financing or payment terms that were agreed upon. Include information such as the length of time or monthly payments that the customer must make. 5. Include any additional information that may be relevant. This may include notes on the customer's attitude or experience, additional sales that may have been made as a result of the sale, or any other relevant details. 6. When finished, sign and date the document. This will help ensure that the details of the sale are accurate and that they can be used for future reference.