Makematic Series on Google Sites: This ten-video series covers the basics of creating, editing, and maintaining a Google Site. Each video covers a different topic and is less than 5 minutes long. Topics include picking a theme, adding and arranging pages, and adding external content.
Coates Library Guide on Creating Websites: Trinity University's Coates Library has a step-by-step guide on creating a Google Site. It includes information on adding other group members to a site and the basics of setting up a new site.