This is nothing different from a document file, but you can work on it to publish on web directly as a web form template. This one is the latest feature of word. You have several integrated programs to improvise your templates in terms of visual appearance. You also have the option to work with the add_ons in MS word. If you work wisely, you can bring out a professional template all by yourself.
Click on 'Insert,' again at the top of MS Word. When the menu appears, let your mouse arrow hover over 'Picture.' Here you'll have several options. You can create your letterhead on the fly using some of those options. However, for our purposes we'll opt to choose 'From File,' since we already have a ready graphic. Click on the option, 'From File,' and a dialogue box opens. Locate your graphic and then click on it and then click the 'Insert' button. Your graphic will then appear inside the dotted box.