As @leothebuilder mentioned, there are a number of resources available. I will add that while the economics of book publishing has resulted in most AutoCAD Architecture books no longer being updated every year, if you acquire the most recent version of the book (assuming it is for 2010 or later, with the ribbon interface), you will still be able to follow along and learn the basics. Those books won't cover the latest features, but will be fine for learning the basics. This assumes that you are using AutoCAD Architecture, a vertical product built on top of AutoCAD, and not just "plain" AutoCAD.
If you would benefit from a tutorial style book that takes you through AutoCAD Architecture's features while working on two projects (one residential, one commercial), I can recommend Paul Aubin's The Aubin Academy Master Series: AutoCAD Architecture 2011. There are other titles by other authors which may also work for you.
FULL DISCLOSURE: I assisted Paul with the editing of the 2010 and 2011 versions of that book, and was compensated for my time. I do not receive any compensation based on book sales.
David Koch
AutoCAD Architecture and Revit User
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