Well Autodesk released a Guide for Family creation. I have not looked at every family and PDF inside yet but the ones I looked at are promising. Take a look at the PDF's and models. They will help a beginner more fully understand a family and family creation as well as a novice enhance his or her families....
The purpose of the Revit Model Style Guide is to define Autodesk guidelines and standards for model creation in Revit® Architecture, Revit® MEP, and Revit® Structure.
All sample family and project files were created based on the Revit Platform 2009 release; therefore, they can’t be opened in earlier versions of Revit."