Part of the process of creating a template is leaving or creating just the information in it that you want. This is the content that you'd want each new document that was based on the template to start with. Much of what you put in the template depends on your own preferences and the particulars of the content.
First, open the document you want to use to create the template (in this case, the invoice document), or open a blank document. Here are typical things you might do afterward:
Leave in the content that's bound to stay the same for a while — for example, your own business's logo, name, and address. (Those things are easy to update in the template when you need to.)
Insert a Date & Time
command for the invoice's date area. This will automatically put the current date into a new document.
Leave text placeholder areas for information that will change per invoice, such as the company name and address the invoice goes to.
Leave empty the areas that will change for every invoice, such as a description of the work done, the number of hours, and the total cost.
Word 2007 features you can add
Word 2007 has new elements you can add. In the first practice session, you saw these in the form of a calendar that let you easily choose a date, and text formatting that set up areas with instructional text. There's a bonus exercise in the upcoming practice session that shows you how to add these. But these are not required for you to create a very nice and functional template.