Best way to study in Copenhagen

Some context, i'm a 17 y.o. coming from italy and I was planning on leaving ny country when 19 to do university in denmark, i would probably be on my own without any financial support from my family and I was wondering if any of you could give me advice on where to rent and to work.btw i intend to go to CBS so if you have any tips on admission or anything else i would be very gratefull. Thank you and have a good day.