The way to ease you is to add sections to the word document in which page you want to add page number. The procedures are (in Word 2007) :
1. Goto Page Layout->Breaks->Section breaks.
2. In Section Breaks zone, you can choose Next Page and some others way to set sections.
3. Then when you want to add the page number into next section. Go to Insert->Page Number->Format Page Number.
4. In Page numbering area, check the start at and set the page number to 1. Then click OK.
Ok, All done. Hope this will help you.