You have your bachelor's in Engineering - Mechanical. Inted to do a Masters in Australia.
A. Have a discussion with your good professors who can give valuable inputs. Then narrow down on the best universities in Australia. Keep in mind the quality of education, the number of students, the scholarship chances, the placements with average salary and student satisfaction. Keep the options open with Singapore also because, they too have good universities that come up in the world rankings. Discuss with your family also regarding finances, student loans etc
B.Now coming to the course with a view of a job. Choose one that is related to Automation, Robotics, Artifical intelligence etc
C. While choosing an International university, most people recommend the QS world univeristy rankings, this is based on academic reputation, employer reputation, faculty:student ratio, number of international students and citations/faculty member.(https://www.topuniversities.com/university-rankings-articles/world-university-rankings/top-universities-world-2018)
D.If we apply these parameters, the best ones are
1.The Australian National University (http://www.anu.edu.au)
2.The University of New South Wales (http://www.international.unsw.edu.au/)
3.The University of Sydney(https://sydney.edu.au/study/admissions/why-study-in-australia.html)
4.The University of Queensland (http://future-students.uq.edu.au/)
5.The University of Western Australia(http://www.uwa.edu.au/)
E. From this list, please visit the website and chekc on
a.Life in the campus
e.Help with study visa and placement
f.fee payment installments, some universities provide financial aid.
g. estimated cost of living as a student
i. health care support.
For instance- Australian national university- college of enigneering
Once you do this, contact them via a email expressing your intentions and the course you choose and seek more specific information and contact details.
F.You have to do some background research of the place you choose in terms of safety, travel options, crime rates, Indian associations in the vicinity etc.
G.Compare countries with the best colleges, ease of getting visa and ease of working part-time as students and future emmigration.
H.Since you are interested in Australia. You will need to meet the strict criteria laid down by the Austaralian government.(https://www.homeaffairs.gov.au/Trav/Stud/More/Genuine-Temporary-Entrant).
I. Lastly do the same for Singapore, USA and Germany and compare the entire cost, visa process, job prospectus and then take a final call. Have a good insurance, take an international driving license and remember to responsibly enjoy your college days bearing in mind that your are in a foreign country following their rules.