Go
here for a similar tutorial on creating a single category page. The only difference is to be sure to select the Archive Page template ( in lieu of the Blog Page template) from the Page Attributes box on the right hand side of your screen when you create a new page.
This is the easiest way to do it without writing a new loop.
If the 'Custom Fields' metabox is not displaying when you are adding a new page, go to the top of the page and click the 'screen options' tab and make sure the 'Custom Fields' box is checked.