Write a Visa application acknowledgement letter to the university. Letting the University know that you are grateful for the visa approval and acknowledge the terms and condition.

Australian Government
Department of Immigration and Border Protection
Dear Sir/Madam,
I am thankful for the acceptance of my Visa. It is a huge opportunity for me to be able to travel out of this place for a better future and career and I as well as my whole family will be very grateful for our entire whole lives. This is going to be a huge opening in my life towards a new future and new opportunities...