Why create one? _ "Re_inventing the wheel", is no fun. If you work for a single organisation it's likely that your templates could last a long, long time with no need to go back to the design board every time you are asked to create a new manual or user guide. When you work for yourself it's a great way to show clients that you have the skills they are looking for without breaking any confidentiality clauses with your existing clients, and with just a little bit of luck they'll adopt your method of working so you can continue to recycle your past efforts too.
But first, let's learn how to create a business letterhead in Word. You only need two things: Microsoft Word and a ready graphic, preferably not wider than 5 inches and higher than 2. In other words, not larger than 5x2 inches. This is, of course, ideal but not necessarily set in stone. Let's begin. Fire up your MS Word. I'm using MS Word 2003 and you might have a different version, but I believe there is not much difference.