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Hi Gareth. I presume you're proposing shooting off the tripod, while waiting for your astronomy gear to arrive. If that's the case, use a high ISO because you need all the light you can get in the shortest possible time. ISO 400 & 800 won't really cut it. Use stacking to bring the noise down. If you bring your aperture down a stop or two from wide open as adman said, you'll improve the image quality considerably in relation to the stars in the corners of the frame for a little loss of light, assuming you'll mostly be shooting at 18mm in the 18-55mm kit lens. At 18mm and shooting the Milky Way through Scorpius & Sagittarius, aim for 25-30 sec subs - longer and the star streaks will become noticeable, even when you reduce size a bit while processing & 'prettying up'. Polar areas of the sky are a bit more forgiving in sky motion.
If you want to zoom in, you'll have to cut your times down. 10 sec is just OK at 55mm for around Milky Way Central, but at say 200mm you haven't got long at all!
Good luck with it - look forward to seeing some of your results!
Cheers -
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