You (or the purchaser or transferee) must complete Form CBS-1, Notice of Sale, Purchase, or Transfer of Business Assets. Business Bill of Sale: This document outlines the sale details, including the purchase price, assets included, and any warranties or guarantees.It includes important details such as the purchase price, payment terms, conveyance of title, and seller promises. Step 1 – Parties and Business Information. A business purchase agreement should detail the names of the buyer and seller at the start of the contract. Stepbystep guide on how to write contracts for leases, business partnerships, and employment contracts.