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Settings will depend on your sky and your lens. I believe there's an ideal ISO setting somewhere around ISO800 which is optimal for astro imaging, but I'm not sure of the specifics.
The aperture will depend on how good your lens is. You want to shoot as wide open as possible, but lots of lenses suffer from sharpness and chromatic aberration at lower f ratios, so you want to stop the lens down to the point where the image quality becomes acceptable. I would start around f/4 or f/5.6
Exposure will depend on all the above and on what you're shooting. Rule of thumb is go as long as you can without over saturating parts of the image. Watch your histogram and back off the exposure if you start hitting the right hand side as you will lose colour in bright objects like stars.
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