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Stick your lens on manual focus and set it to infinity.
30 seconds is the longest exposure that the camera can time. Bulb setting allows you to go for as long or short as you want, but you need to hold the shutter down for the duration of the shot or use the remote shutter control (and lock the button down).
FYI, the pins for connecting the remote shutter are simple. Top pin is ground, left is shutter, right is focus (half press of shutter button). The remote release simply shorts the ground and shutter pins. I have tried it with a screwdriver.
Exposure time for star trails depends on the focal length. Even with a 50 mm lens I get small trails in less than 30 seconds. With a 300 mm focal length you'll get them very quickly.
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