The thread is probably the wrong section. Employment would be more appropriate.
As stated, don't get a criminal record.
Perhaps utilise some initiative and go to
www.police.nsw.gov.au
There is sufficient information there.
If you feel disinclined to undertake 12-36 months of study/training, but still want the uniform go to either:
www.dcs.nsw.gov.au , or
www.sheriff.nsw.gov.au