While outgoings may be controllable, incomings may not be (ie: you'll get paid what the employer offers or what the 'award' rate is).
There are a few websites which quote salaries which might be useful to guage level of income you can expect in your occupation, eg:
Industrial Relations for award rates in SA
PayScale Australia - South Australia State Salary, Average Salaries
The Australian Bureau of Statistics says the average weekly wage in Oz is around $1250 (I'm guessing this is before tax) but remember, that takes in all the High Court Judges amongst us!
6302.0 - Average Weekly Earnings, Australia, Aug 2010