To be registered as nurse in Au, one of the current basic requirement is 450 hours of experience, roughly translates to about 3 months full time work. Other than that, you will have to undergo the bridging program... which is being phased out or the new pathway which is to be implemented sometime this year.
Another option, since fresh grad ka naman is to take a nursing conversion course which depending on the assessment of your credentials make take from 1 to 2 years.
Dami na po discussion about these choices dito sa forum so I won't elaborate na.