As far as equipment goes, the most important thing you can bring is a tripod and a cable release to avoid the dreaded shaken-photo syndrome. If you don’t have a cable release, set your camera’s self-timer to two or ten seconds’ shutter delay, if available.
There is no single setting for your camera that ensures great captures, but if you have manual options, you are probably best served with experimenting with various combinations of ISO, aperture, and exposure settings. As a rule of thumb, ISO settings between 800 and 3200, aperture between f/2.8 and f/5.6, and shutter speed at between 15 seconds and 30 seconds have proven effective.
Different combinations may give very different results. Higher ISO settings will allow you to capture faster exposures but may also result in grainier images, for example. Note that shutter speeds of above 15 seconds will result in slight star movement. Wider angle lenses are usually more versatile in low-light settings, but longer lenses give you different options for compositions. Make sure that you remove all lens filters, as they may distort images. You will probably get the best results with manual settings for infinite focal length.