You have to sit for the exam, Locations near CBD is City or Parramatta. We can make an appointment
via calling this number 131880.

The exam text book changes from 19th October 2009, so

before 19th Oct 09
Book: http://www.citizenship.gov.au/learn/cit_test/_pdf/citz-booklet-full-ver.pdf

after 19th Oct 09
Book: http://www.citizenship.gov.au/learn/cit_test/_pdf/Australian%20Citizenship%202009.pdf

Once we successfully pass the exam then we apply for Citizenship by filling in a application form
1300t: http://www.immi.gov.au/allforms/pdf/1300t.pdf
OR
apply online: http://www.citizenship.gov.au/applying/fees_forms_appeals/online_apps/

It is going to cost you $260/pp.