I hope this helps. I just completed a DV project w/ bluescreen (blue because we had a lot of green in the shots). A couple of notes:
1) Post (assuming Flame or Smoke) may pull a luma key as well as chroma; screen should be lit at least 2 stops brighter than tthe rest of the scene. This will let post tweak both luma and chroma.
2) Greater the distance between subject (forground) and greenscreen the better. Make sure the screen is evenly lit w/ no shadows.
3) Avoid any narrow vertical objects in the foreground...such as oar handles. These become more difficult to key around.
I would light the set as close to finished picture as possible. Since you are shooting "night" you shouldn't have to worry about overlighting, but don't go too dark either. If you have the luxury of color correction, you should be able to adjust the picture to your desired final look if you don't lose all your detail info (in blacks and whites).
I would try to make the sceen the brightest object on the set. I don't know exactly how you intend to effect the moon (practical or sfx), so I'm not sure about lighting of the moon relative to the screen.
Hope this helps.
Lyle
