Have a look at:-
http://www.roymech.co.uk/Useful_Tables/Drawing/Drawing.html
Helpful guy too - seems happy to answer questions!
Not sure what standards Australia generally works to (if you know what I mean - I'm sure they are good ones!).
Here, (in UK) we base our drawings on the BS EN 61082 (or IEC 61082) standard of presentation, using symbols based on BS EN60617 (IEC 60617).
John