If you ask the Office Assistant about this, you won't get a good answer. The assistant will tell you about changing the header or footer at different places in the document by creating new sections. That will work because the header/footer instructions are stored in the last paragraph marker of the section.

Each section can have up to three different headers and three different footers. Every document has at least one section but can have more. The number of header/footer sets for each section is controlled in 

File è Page Setup è Layout (tab)

by checking either or both of the options:

__ Different odd and even

__ Different first page

in the headers and footers frame. 

If you have already set a header or footer and then check "Different first page" the header/footer you set previously will become the header/footer for second and subsequent pages. If you check different odd and even, you can set yet another header/footer for the odd pages that follow page two.

Many experts believe that using headers and footers is the best way to construct a letterhead template, with the letterhead itself in a header with headers/footers set for "Different first page."  (Something similar is done when setting up for preprinted letterhead as well. Even if you will be using preprinted letterhead, follow along, then take a look at the Letterhead Textboxes and Styles Tutorial.)

If your template is only one page but the document based on it can be multiple pages, you will want to set up the header/footer for all pages or for the second and subsequent pages before setting a different header/footer combination for the first page. (The header/footer for all pages becomes the header/footer for second and subsequent pages when you select the option for a different first page.)

To do this, first (with your template being only one page), . . .

Switch to the Header/Footer View pane.

View è Header and Footer

The Header and Footer toolbar will pop up and your insertion point (cursor) should be in a box with a dashed border that says "Header." (If it says "First Page Header" don't worry, we'll get to that in a bit. Keep reading.)  If you are in "Normal" or "Web" view when you tell Word that you want to view Headers and Footers, you will be switched to Page Layout (Print Layout) view and any text on your regular page will either turn gray or disappear. When you close the Header and Footer toolbar, you'll be switched back to the view you started from.

Create the Header for All Pages or for Second and Subsequent Pages

If you want anything to appear in the header for all pages or for the second and subsequent pages, put it in here (in the window designated "Header"). 

Create the Footer for All Pages or for Second and Subsequent Pages

If you want something in the footer for all pages or for the second and subsequent pages, click on the "Switch Between Header and Footer" button on the Header and Footer toolbar.

This will take you to a box at the bottom of the page that says "Footer."

Create a Different (or No) Header / Footer For the First Page

Click on Page Setup on the toolbar. 

This will display the Page Layout Dialog Box. 

Check the box for "Different first page" and then click on OK to close that dialog. Now the header box will say "First Page Header" and anything you typed in the " Header" box before will be gone! 

Type what you want to go in the header on the first page of your document, then click on the Switch button and type in anything you want in the first page footer.

Save your template. When your template is used to create a document, if the document extends onto a second page, the headers / footers you originally typed will appear on the second and subsequent pages.

What If It Says "First Page Header" When I Said It Would Say "Header?" in the Box's Border?

Then type in the material for the header / footer to go on the first page. Click the "Close" button on the Header and Footer Toolbar and insert a manual page break. That will move your insertion point into Page 2. 

If you now use

View => Header and Footer

the same toolbar will pop up but this time the caption in the dashed border of the box will be "Header." Type what you want for your second and subsequent page header here, switch to the footer and type that for the second and subsequent page.

Click Close on the Header/Footer Toolbar and use backspace to delete your page break. 

Save your template.

I have read the Special Edition Using Office series from Que since Word 97. It has the best explanation of using the letter wizard with your own templates that I have seen and also has detailed instructions on inserting information from your Outlook Contacts into Word letters and other documents. That alone is worth the price of the book. (It also includes the WOPR utility which still manages to stretch and really use Word features that are otherwise tough to reach.)

In SE Using Office 2003, this information on letters and using Contacts info is in Chapter 19 under Creating and Editing Letters.

Special Edition Using Office 2000 by Woody Leonhard and Ed Bott
(Special Edition Using Office XP by Woody Leonhard and Ed Bott)
(Special Edition Using Office 2003 by Woody Leonhard and Ed Bott)