Autodesk provides a variety of online materials that help you to learn and use AutoCAD® MEP 2012 software or to develop complementary products. These materials are available in several formats.
http://exchange.autodesk.com/autocadmep/enu/help
http://exchange.autodesk.com/autocadmep/enu/video-playlist
http://exchange.autodesk.com/autocadmep/enu/pdf-documentation
Additional documentation is available in multiple languages from the language drop-down list in Autodesk Exchange: http://exchange.autodesk.com/autocadmep/enu/help