Welcome to the forum
Google earth will be your friend. Everyone spends countless hours and gallons of gas scouting, and for many Google Earth is where it starts. I start by my house and work my way out marking potential spots and eventually driving to them. There can be some good hunting here, but NH certainly not a place people seek out to duck hunt! haha I've shot birds in swamps, ponds, lakes, small rivers, big rivers, tidal rivers, and the ocean. Any body of water has potential, but I;ve also scouted and hunted spots without seeing more than 1 or 2 in the distance.
I know from metal detecting near there that there can be lots of fields in SW NH. Could be worth scouting fields for geese