More rules apply to selling meat and dairy products than to selling vegetables or baked goods. As you process, package, and sell these items, you will have to follow state and federal laws. For meat, it usually needs to be processed at a place that is inspected by the USDA. To make dairy products, businesses need to get certain licenses and often have to meet health standards. To get more information, you can call the Maine Department of Agriculture, Conservation, and Forestry.