A business purchase agreement should detail the names of the buyer and seller at the start of the contract. Identify the parties involved in the transaction. 2.Explore our guide on business purchase agreement PDFs, covering all you need to know from drafting to common mistakes. Business Bill of Sale: This document outlines the sale details, including the purchase price, assets included, and any warranties or guarantees. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price.