Kingfishers are very difficult to get close to so you need a long lens like 300mm plus. River banks or, later in the year, ponds and lakes. You need to talk to other photographers who visit that place and they will tell you the best place to see Kingfishers, and you still need to spend hours waiting for them to appear. Fishermen see lots of Kingfishers as they use bait to attract fish and the birds know this and will usually be around.
Nuthatches can be seen going up and down tree trunks looking for insects, so keep your eyes open in the forest. In Autumn, Winter and Spring they look for nuts/seeds which people put out on posts or cut tree trunks. I use seeds myself at those times of the year and the Nuthatches always turn up on most occasions. If you look at the Wildlife & Nature photo section on page three under Birds of Sandwell Valley you will see a photo of a Nuthatch using seeds on a post to attract it.
As for Mandrain Ducks you just have to wait for them to appear if you are lucky to have them in your area. I have been going to Sandwell Valley for ten years and it took five of them before I could photograph a Little Owl, and another three years before I had a second chance of another photo.