Click on 'File' at the menu bar and then click on 'Save As.' Name the document. Then, just below the file name is the dialogue, 'Save as type:'. Choose 'Document Template (*.dot).' You'll notice the directory at the top of the dialogue box changes to 'Templates.' Click 'Save' and you're done.
What's format? _ This is the layout of your document, where you decide the key order of the components (or chapters) of your standard. So for a user guide this might be; Contents Page, Product Introduction, Product Photo, Full User Guide, Quick Reference Guide, Copyright Statement, and Disclaimer. You can add as much or as little detail to each section as you feel necessary.