Note: This form must be downloaded to your device in order to be filled out properly. It must be opened in Adobe Acrobat Reader.An asset purchase agreement is a legal document used when buying or selling a small business. Read on to understand the basics. How to fill out the Agreement of Purchase and Sale of Business Assets? 1. Read the entire Agreement carefully. 2. Commonly Used Forms. Business Certificate Order Form, Fill out and complete the PDF to order a copy of a Business Certificate.