Alright, so if we just assume for a sec that your photoshop skills are good enough to do the composite nicely, your biggest problem will be lighting and photography. You probably want to get an appropriate sense of scale ont he ships, so any sort of zoom lens is an absolute no-no. it's best for you to use as wide-angle of a lens as you have.
Next up: Lighting. it mustr be consistent. Basically, you don't want the lighting on the water coming form the left, one ships, lighting form the front, and the other's from the right. that's an exaggeration, but try to get the angles as close as possible. Keep the lighting far away. if the lighting is too close, you can sometimes get a strange sense of scale because shadows will cast radiatin from a close light source. The sun of course, give practically linear light, so keep your source distant or use the sun.
Make sure the ships are photographed under the same lighting. You don't want one with harsh-edged shdows and the other under a really diffused light.
So yeah, that's all pretty obvious, really, but I've seen lots of amazingly bad compositing in publised images, so there must be some people who never think about it.
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