You must receive a Certificate of Assumed Name from your county clerk. This certificate is often called a "business certificate."You must file the certificate in the office of the County Clerk in the county where your business is located. Get the Certificate of Assumed Name form. These forms are available at most stationary stores that sell business forms. You will need to buy three. To search a business or corporation on file within the Queens County Clerk's Office please access our link below. Below is general information for schools, and for vendors looking to do business with us. Next, specify the details regarding the Purchase Price and terms. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer.