The width of your bandsaw blade and its tooth set will determine the smallest circle you can cut without damaging the blade or the saw guides. Generally a 3/16-in. blade will cut a radius as small as 5/16 in.; a 1/4-in. blade will cut as small as 5/8, and a 3/8-in. blade as small as 1-7/16. The wider a blade, the thicker it will be and the longer it will stand up and keep its edge.
Many of your questions should focus on potential problems and maintenance issues. Does anything need to be replaced? What things require ongoing maintenance (e.g., paint, roof, HVAC, appliances, carpet)? Also ask about the house and neighborhood, focusing on quality of life issues. Be sure the seller’s or real estate agent’s answers are clear and complete. Ask questions until you understand all of the information they’ve given. Making a list of questions ahead of time will help you organize your thoughts and arrange all of the information you receive.