Incorrect.They can only introduce an order proposing a law. A non Parliamentary committee writes it. It's read in house 3 times, voted on and sent to the Senate who agree its a law or quashes it.
Governor General giving it Royal Assent makes a law.
The ministers office writes the proposals (laws) and it is then sent to the affected ministers that vet the proposals which then is sent to parliament. Once it is passed, by house and senate and pencil whipped by GG, it then becomes law for all government departments to abide by.