First of all buying a bike will not save money...
they are not incredibly cheap and you can't afford to skimp on tyres and maintainance or you run the risk of dying

Defensive driving is a must... you pretty much have to act as if everyone on the road is drunk, stupid, trying to kill you... or generally all 3 at once for perth drivers

You cant use a bike as a daily driver, you have to have a car as well...
Ride in good conditions
ALWAYS wear protective gear...thongs, shorts, t-shirts are just stupid
Always stay alert and anticipate as many dangers as you can
Ride within your limits
There are two type of motorbike riders...
Those that have crashed, and those who are going to crash