Hi, I would like to recommend a free 2D drafting CAD package from Solidworks' website (http://www.solidworks.com/sw/products/free-cad-software-downloads.htm). It works well and they have free training as well http://www.solidworks.com/sw/products/draftsight-learning-resources-thankyou.htm
I'm using it at the moment and the commands are very similar to other CAD packages and I think it's not too shabby for a free software package.