Templates are predefined documents set up with the fonts, line spacing and other formatting features that you use most often. You can use a template over and over, without having to create the document's look from scratch. Using templates can be a real time-saver.
Word includes a number of built-in templates.
Go to Tools, Templates and Add-ins. Find the name of the template you need and click to open it. Before proceeding with a new document, give it a new name. To create a template, hold down Control-N, for new document. Go to File, Page Setup and make the desired changes for margins, headers, paper size and other style matters, then click the Default button.