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Links..

General wisdom is, Auto-desk Inventor is a good CAD choice.
Free student edition (you must register to get a serial number)  http://students.autodesk.com/
Tutorials http://wikihelp.autodesk.com/enu?adskContextId=HELP_TUTORIALS&language=ENU&release=2012&product=Inventor
Complete Tutorial and Help files (500+meg) http://images.autodesk.com/adsk/files/inventor_full_help_2012.exe
Auto-desk Inventor Wikihelp  http://wikihelp.autodesk.com/Inventor/enu/2012

Hobby Shop http://www.hobbyparts.com.au/catalogue/