You need to check the time table for bus or train services
I am from Hong Kong. We got the world class public transport. So, I don’t need to check the time table first. But if you vist Australia, I suggest you go online to check the time table. Even you vist the major cities. I have lived in the largest city in Australia , Sydney for around a year. They got very frequent train service during weekday. But at the weekend or late night, there may be every half hour for a train. So, please go to
http://www.transinfo.qld.gov.au/ (Brisbane)
http://www.131500.info (Sydney)
http://www.metlinkmelbourne.com.au/ (Melbourne)
Moreover, they have a journey planner which will suggest which bus or train you should take!