You'll need to first open the existing Word document that you want to build the template from. Apply whatever formatting or text that you'd like to see in the template.
Then click on the Microsoft Office button 
in the top left of the Word window and then click on Save As > Word Template from the popup menu.
When the Save As window appears, click on Trusted Templates in the left window. Then enter a file name for the template and click on the Save button.
Now you can close the template file. To do this, click on the Microsoft Office button in the top left of the Word window and then select Close from the popup menu.
