To do startrail,
Bring:
Tripod, wired shutter release, lots of battery, torchlight,
Just set to 30sec shutter and lock the shutter release.
Taking a super long single exposure is not recommended due to noise.
The camera will keeps on taking a 30sec exposure.
Let it run for as long as time/battery/your patience permits, and you may need to cover your eyepiece to prevent stray lights from your torch.
It does not matter if the foreground is underexposed 30sec
Lastly, take a properly exposed frame of the foreground using bulb mode
Stitch all photos using a photoshop action and viola, you get a trail
You will need a foreground with interest, such as a lighthouse etc to anchor your photo to make it interesting.
And yes you will need a wide angle or a fisheye.
The area should be as less light polluted as possible and do not move the camera or else you will not have a nice stitch.
To stack images and keep the brightest light for each frame use...file/scripts/statistics located in the scripts area in CS3. Set your stack mode to maximum and load the files.