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With a 75mm telescope, using low power you'll be able to see the 600 or so objects plotted in Tirion's Bright Star Atlas - provided you have a decent 6X30 or better finderscope on your telescope to actually locate them.
Unfortunately on inexpensive telescopes, manufacturers often cheat so that what looks like a 5x25 or 6X30 finderscope has an internal annulus to sharpen the stars, but turns the finder into hopeless 5X10 or 6X15 ones. Sometimes one can unscrew their front lens and remove the annulus, which then results in lousy star images but makes them more useful for locating faint objects.
If your telescope is well collimated, you can expect relatively good images of Jupiter and Saturn and should be able to make out bands across the surface of Jupiter. High power eyepieces usually provided with inexpensive telescopes are usually of the SR type which are hopeless. The Huygens eyepieces often provided for lower power aren't too bad image wise, but have an annoyingly narrow field of view.
I briefly owned a 70X700 and was quite impressed with it, so much so that I took it back and exchanged it for a 114X900. Unfortunately, the newer telescope wasn't as good as the first one because its collimation was out, and it took me years before I found good instructions to get it right (we didn't have the internet back then).
Also, as you live in Mt Martha, you can at some time join the Mornington Peninsula Astronomical Society who do their viewing at the Briars, where they have a great clubhouse. You can check out all sorts of telescopes there.
Regards,
Renato
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