The Earth rotates around the north and south poles, so all star trails are centred above them. If you want to position this centre point exactly you'll need to locate the North Star, Polaris (northern hemisphere) or the South Star, Sigma Octantis (southern hemisphere). Your star trails will form a circle around this point, so position it appropriately in your scene.
Long exposure star trails on their own make stunning photos, but you may also want to include some foreground objects. be sure not to place them too close though or they will be out of focus thanks to the wide aperture.
If you do use foreground objects, the ambient light will often illuminate them nicely, but if not consider using them as silhouettes instead.
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