Decks come in many different widths. If you are a beginner to skateboarding, choose your deck according to the width, not the length or wheelbase. The width you need depends on your size, skating style and personal preference. Here are some general guidelines.
7.5" to 8" - Standard board for adult riders skating streets or doing more technical tricks
8.0" to 8.25" - Skating pools, ramps, and parks
8.25" and larger - Vert, pools, cruising, and just going old school