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I don't want to dampen your enthusiasm but I have a 12" scope and wouldn't bother with most galaxies or planetary nebulae in the suburbs. Too much light pollution.
The theoretical limiting magnitude for a 5" scope is 12.5 but the practical limiting magnitude is probably closer to 11. In light polluted suburbs, depending how far out you live, you could probably take off another 2 magnitudes, which would make your scope's effective limiting magnitude nearer to 9. Anything above magnitude 8 is going to appear quite dim and anything above 9 virtually invisible. So, even the "bright" Sombrero at magnitude 8 will be quite dim.
There are plenty of open clusters, globular clusters and double or multiple stars you can look at brighter than magnitude 7. As well as the Moon and planets. Save your planetary nebulae and galaxies for the camping trips.
If you are in Southern Sydney, you can always join the Sutherland Astronomical Society and do some viewing at Waterfall. If in Western Sydney, join us at WSAAG and do some viewing at Linden.
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