Try the King package. If you can get past the intentionally corky presentation their material actually works very well. Downside - Pricey.
Learn to Fly! | King Schools
I believe Jeppesen also have G1000 packages but they are separate for different needs VFR/IFR etc and I would imagine you need to start at the VFR one first then move on. Pricey again.
JeppDirect | Aviation store for Jeppesen charts, pilot training, aircraft parts & pilot supplies.
Max Trescott's package seems to be popular and more affordable.
Garmin G1000 Glass Cockpit Handbook and CD-ROM Course
Pros, Cons....choices, choices.