You can best be prepared by learning about the business you are offering to purchase. Carefully review any documents (information package, financial statements, lease, etc.) provided by the Seller; they contain valuable information. Have a thorough understanding of how the business makes money, and a clear vision of what your primary role in the business will be. Visiting the business and speaking with the Seller is often informative, so ask your Broker to arrange these discreetly.  Lastly, if you have any questions, keep a running list, and ask the Broker! They are the best source of information on the business you're considering.