I’m a newbie too Johnny. I have a Skywatcher 8” Dobsonian which has the same 10mm & 25mm EPs that came with your scope.
You say about the EPS that came with your scope: “I don't know how the supplied ones go but to my untrained eye they at least look well made.” But it’s only after you’ve tried some other EPs that you will be able to truly judge them.
My advise is to hold back on buying any EPs until you get a bit more experience and are better able to judge what’s best for what you want to observe. What I’ve learned so far from my limited experience is that I prefer EPs with a wide field of view and good eye relief.
However getting a “good” Barlow at this stage could be worth while as the 25mm Barlows very well, giving a wider field of view and better resolution than the 10mm. It will give you a good way of judging the 10mm. I don’t like the 10mm at all and prefer using the 25mm Barlowed.
Others have been recommending software, but an excellent book to consider is "A walk through the southern Sky" (third edition). It is specifically for the southern hemisphere and helps you find your way around the sky using signpost stars and constellations using the naked eye. Your library probably has a copy you can check out. I found it so helpful I bought a copy.
As for what to look for, I’ll leave that to the more experienced. But the one thing I would say is seeing Saturn is a must!
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