http://www.AsktheBuilder.com founder, Tim Carter, demonstrates how to create the correct spacing for piers for a DIY shed. You have to keep in mind where the floor joists will be so you don't put a pier under a joist.
For more DIY Shed building tips and information and the actual plans for the shed in this video, click the following links:
SHEDS for STORAGE:
ACTUAL SHED PLANS: