Not sure if everyone already knows about this but I thought I would share it for teams who don't have a resource to learn how to use CAD.
Solidprofessor.com offers tutorials on how to use solidworks, mastercam, autodesk and other pieces of engineering software.
I cannot speak to the quality of the tutorials as I have not looked at them yet but FRC teams can request a free license to access their website. I believe it is only 1 license per team. The link for FRC specific teams to apply is
http://solidprofessor.com/frc
Our team just submitted our information and we are waiting to receive our license and get our new students trained!