Create a sitemap or category structure

index.php
8-books
9-mp3s
10-games
11-tricks and tips
12-hardware
13-accessories

Create the pages for each section or category

books.php
mp3.php
games.php
trickstips.php
hardware.php
accesories.php

Using the following code and changing the category number to suit in each page. The code below would correspond to the "books" catogory.

Program in the categories in to Wordpress index.php