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:
You can also find documentation on au.autodesk.com
Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register
Start with some of our most frequented solutions to get help installing your software.