Community
I don't know of any specific tutorials/guides off hand, but you can try searching this forum and perhaps YouTube using relevant keywords - you'll have to be much more specific about what kind of Families you're intending to create.
Here is the link to the Autodesk Revit Families Guides:
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=13080413&linkID=9243097
You can also find documentation on au.autodesk.com