If you want each section to start at page 1, you'll need to turn Same as Previous OFF, otherwise the numbering will continue from the previous section.
1. Go to the first page of your next section and click into the header or footer. You will see the words "Same as Previous" displayed on the Header and Footer border (dotted line). To turn this option OFF, click the Link to Previous button on the Header and Footer toolbar.
You should no longer see the words "Same as Previous" on the border. 
2. Now that "Same as Previous" has been turned off, you can change the number format for this section. Select the page number and click on the Format Page Number button on the Header and Footer toolbar. The Page Number Format dialog box opens. Click on the radial button next to Start at and make sure there is a 1 in the box. To change the type of numbering, select one from the Number Format drop-down list. Click OK. 
If you have more sections in your document, you will need to repeat these last two steps in each of these sections.