Hi Greg,
Congratulations on your 10" dob. It's a serious telescope that you should get several years of enjoyable observing from. When I started observing 47 years ago a 10" telescope was considered "huge".
In all honesty you could spend 2 lifetimes trying to observe every astronomical target that was within reach of a 10" telescope.
The critical thing if you live in urban Sydney is to get yourself to some proper dark skies. Newcomers often have trouble grasping the benefit of proper dark skies. Those don't really exist within 50km of the Sydney CBD and if you can get further away the better.
Cheers
John B
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