What options are there to learning IFR flying on Garmin's G1000 (Cirrus Perspective)?
You can get books on the subject, but one of the best ways to learn the G1000 is practice.  Fortunately, Garmin sells a G1000 simulator which can be installed on your computer and replicates all of the G1000’s capabilities.  Along with a joystick and throttle you can plan and execute flight, fly approaches, and practice anything else on your PC.  They are available in a variety of G1000 setups, including the Cirrus Perspective.  Cost is $25.

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