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Welcome to the moneypit that is astrophotography.
1. the less glass you can introduce between the optics of the telescope and the sensor, the better your results. The answer to this problem is to go to dark sites.
2. I think the '6' shaped stars are due to a bump in tracking.
3. I'd imagine that an MPCC will fix that, unless it was slop (was your camera tightly connected, and, is it too heavy for the focuser?).
Also, ISO-1600 will ruin your images. Drop it to ISO-400. You can already see in that 15-second exposure that Sydney's skyglow has almost killed your image.
A lot of people have the philosophy of easing into photography. I say, jump into the deep end and learn how to swim. Instead of taking one test exposure, devote the entire night to imaging a single object. As well as taking your dark frames and flat frames (both lights and darks).
H
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