First of, you need to remember that Australia has the lowest conversion rate to residency programmes and even lesser for surgical specialisations. Now if you have completed your MBBS in India, you will have to appear for AMC exam and clear the exam. Then you have to pursue an internship for atleast 2-3 years before you become eligibile for a Residency programme. It ideally takes 4-5 years to get into a residency programme in Australia. The fees might vary from 12,000-15,000 Australian Dollars. And this might change periodically. https://ama.com.au/careers/pathways/neurosurgery