This link should give you an idea of the general cost of living in Wollongong :-
Cost of Living in Wollongong, Australia. Prices in Wollongong.
It wont be exact but might give you a starting point from which you can investigate further.
I am also enclosing an estate agents link to give you an idea of property in the area :-
Real Estate & Property For Rent*in Wollongong, NSW 2500 (Page 1) - realestate.com.au