Hi Matt,
Welcome. My first scope was a home made 6 inch reflector. I observed with this scope from light polluted suburban Brisbane for many years. Even though a six inch gathers 50% more light than a 5 inch, views are similar enough that I think I can give you some indication of what you can see.
Apart from the obvious Moon, Jupiter, Mar, Saturn, Venus.
There are numerous bright deep sky objects that are worth looking for. Observing from inner Brisbane, I suspect you won't see the fainter more challenging objectsin the list. Thise marked with a * are the brightest objects which should be visible even from a moderately light polluted suburban Brisbane. They will look much better from a dark sky, this is, of course, true of any telescope.
Search on any of these names and you'll find information about them and their location.
Globular clusters
Omega Centauri *
47 Tucana *
Messier 4 *
Nebulae
Orion Nebula *
Lagoon Nebula *
Trifid Nebula
Eta Carina *
Messier 17
Galaxies
NGC 253
NGC 55
Andromeda Galaxy
NGC 5128
NGC 1365
Messier 104 - Sombrero Hat Galaxy
Planetary Nebulae
Messier 57 Ring Nebula *
This list is certainly not exhaustive.
You'll need a star atlas or planetarium program. As a beginner, a chart that covers a big area of sky is better so that you can see the brightest stars. There is a free printable PDF atlas called Taki's star atlas modelled on the classic Norton's star atlas.
http://www.geocities.jp/toshimi_taki/
Under
Astronomy.
"Tools for Observation"
Click on link #2 - Taki's Star Atlas.
Cheers
Joe