Planets will look small, but you will be able to see quite a bit of detail on Jupiter eg cloud bands, Great Red Spot, moons in transit as well as their shadows. On Saturn you will see rings and some divisions and a hint of cloud bands, Venus is always white, but you will see its phases. Uranus and Neptune will be blue or blue green discs. What you see on Mars will depend. YOu will usually only get to 300X magnification as the seeing gets worse above that & it all blurs. But you can see a lot at lower mags. Big globular clusters will be impressive, with lots of resolvable stars, open clusters will be beautiful patterns of stars of various hues, nebula will be grey areas of haze, but many will have interesting shapes and dark lanes. Galaxies will also be patches of haze and some will show some detail if you use averted vision.
Above all, you will see more as you learn to observe rather than just casually look. If you look through observation reports you will see that Rob K for example sees heaps more in his 4 1/2" scope than many do in larger ones. What PGC hunter sees through his 12" in light polluted skies is phenomenal compared to what I see through my 16" in dark skies, although I am learning. So if you have modest expectations and patience, you will see a great deal. And if you use averted vision.
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