The dialogue box for adding page numbers is found under Word's Insert menu with the Page Numbers option. This box lets you choose where you want the numbers to appear on the page and how they should look. Click into each section to adjust the page numbers for that chapter.
Uncheck the box next to "Show number on first page" in the Page Numbers box. This will remove the page number from the first page of your document. Handy if you've got a cover page.
Next, click the Format button in the Page Numbers box. Click the "Start at" button and type in the page number you want for the start of the numbering. Even though it won't display the number on the page, Word will count the chapter division page and display the next number on the following page if you have chapters. If you don't want the chapter-division pages numbered or counted, start the page sequence one number earlier in the "Start at" box.