This video will go over the basic aspects of the G1000 autopilot.

Flight Director: FD
Auto Pilot: AP
Roll Hold: ROL
Heading: HDG
Navigation: NAV (GPS, VOR1, VOR2)
Pitch Hold: PIT
Selected Altitude Capture: ALTS
Altitude Hold: ALT
Vertical Speed: VS
Flight Level Change: FLC
Nose Up: Nose UP
Nose Down: Nose DN

If you have questions about how to use the autopilot leave a comment below.