Help ... :D

Hello every one,  hello Australia ,  i m Oussema Mrad from Tunisia , i m 23 years old and i just graduated as interior architect .. , i m also a basketball player in a team here and kind of athletic guy spearfishing  gym windsurf and many other stuff ... I will come to Australia to study in an other domaine which is fitness undestry i will study to be a personal coach..  I speak English , French and Arabic . The college i m going to study in have 4 different locations in Sydney ,Melbourne ,  Perth and Brisbane ... I want your help telling me as a student and a new in Australia where should i go and which one is less expensive in life coasts ...  Final question its about renting houses what you recommend for me ? That will be so nice from you to help me ..thank you all .. I will be waiting for your response have a nice day .