Autodesk Revit Architecture

[#1]

I would like to learn much about parametric .. families..

and using Multi families..

Where should i get training video... and training files..

I am using revit 2012

Somebody help me ..

Thank you very much.. 

[#2]

autodesk website has some nice tutorials on family creation

[#3]

Our site offers eLearning for all the above.  http://www.cadlearning.com