Using a boat for a shooting platform is going to be a handicap for starters. Your next decision will be whether you want to freeze the action of the fireworks or produce images of blurred streaks of multicolored lights. That decision will affect the choice of shutter speed you need. Fireworks, depending on your distance to them, tend to take up a considerable area, thus a less than telephoto lens is going to suitably provide the field of view you'll need. All that said, my biggest concern would be the stability of the boat.
Additionally, not having used the camera prior to the event is another handicap, as you'll not be completely familiar with settings and nuances of the camera. This can lead to a lot of hit or miss photos.
Cryppy wrote:
I recently purchased a Nikon D7200 and, due to circumstances, the evening of the 4th will be my first night shooting opportunity. I'll be in a boat shooting fireworks in Bar Harbor, Maine. I'd like some pointers on how to achieve superior images, please. My kit includes all Nikon lenses with AF and VR: 18-200mm, 70-300mm, 105mm, 35mm 1:1.8G, 18-55mm, 55-200mm. My first choice would be the 18-200 but will defer to recommendations from those of you who have experience shooting fireworks.