G'day Micko,
Be careful, you'll get addicted and it will dominate your life!
Herping can be as difficult or as easy as you want - it all depends on the species you want to find. A big part of herping is picking your times - I don't go herping often, but when I do I normally have a lot of success as I pick the right times.
If you want to go for an easy stroll and spot a few different species, places like Boondal Wetlands, Mt Coot-tha Botanical Gardens and Karawatha Forest will turn up several common local species such as Water Dragons, Bearded Dragons, Water Skinks, Green Tree Snakes, Yellow Faced Whip Snakes, Red Bellied Black Snakes, Carpet Pythons and Lace Monitors...
Good luck!