assuming you have an equatorial mount, yeah i'd set it roughly to the south celestail pole. it just makes things a bit easier when you are tracking something accross the sky
4.5" is a fine size for seeing stuff but dont expect what you see in pictures. even a 10" wont give you the scale you see in the pictures show on this forum. be aware that atmospheric conditions will effect greatly what you see when looking at jupiter so its possible that under better conditions you will see more
I looked thu a mates 78mm reflector and saw more than just belts so keep at it.
welcome to the forum by the way