First, Insert > Header > Edit Header
See:

• Setting Up Letter Templates - Ribbon by Suzanne Barnhill, MVP and
• my pages How can I get a different header/footer on the second page? and
• Letterhead Textboxes and Styles Tutorial

I will scrounge some macros. Again, I want to stress where possible using templates rather than documents. Reusing documents is a recipe for problems. About the only documents I reuse are logs where I keep date stamping and adding information.


Here is my page on AutoCorrect, Auto Text and Building Blocks.
Automated Boilerplate Using Microsoft Word