Below are video and links to videos that will help you to not only construct your wiki, but give you more ideas on how to implement wikis in your classroom.

Wikispaces Tutorials

Wikis in Plain English

This video is from CommonCraft. Visit their site and watch more videos - http://www.commoncraft.com

Wikispaces for Educators

This video shows you how to create a wiki and apply for a free K-12 educator upgrade on Wikispaces.

Safety and Best Practices
Everyone Knows your Name - internet safety - from boveriec and Youtube