Hello. To become neurosurgeon in australia, you need to clear AMC exam. Soon after that, you need to do an internship for atleast 2 to 3 years before working. Then you need to be eligible for residency. It takes 4 to 5 years to get into residency. After this 2 to 3 years if internship, you  an search for jobs where different places have different criteria.

The cost might take around 40,000 dollars per annum. A bit risky and difficult one