If you are serious about Barbarosa and want the definitive resource for Armor regarding it, you should pick up this book, it's incredible:
Panzertruppen: The Complete Guide to the Creation and Combat Employment of Germany's Tank Force, 1933-1942. Thomas Jentz.
As true to any Jentz book, the details are impeccable. You'll get everything from after action reports, platoon strengths down to radio frequencies used.
You can find it for about $40 from independant book stores through Amazon.
If you have specific questions, I'll be glad to look them up.