To prepare the Certificate, follow the instructions on it. Interrogatories are served on the other parties in the case but are not filed with the Court.This sample form shows the basic structure of a typical Certificate of Service. Use this template as a guide to draft a certificate that states discovery documents have properly been served on parties to litigation. On each page, write in the page number and the total. Write the address of the party where you mailed the copy to or where you hand delivered the copy. Fill out, sign, and submit a certificate of service to the clerk, including each of the parts below. Be sure to sign your responses. Fill in the "certificate of service" on the last page before mailing them back to the other side. This sample form shows the basic structure of a typical Certificate of Service.