While your camera will have a setting for shooting in black and white, you’re better off shooting in RAW and converting your images to black and white in post-processing. Shooting in the RAW format gives you the most data-rich images, so you have more to work with in editing. You’ll also have the option to create color portraits from your shoot if you like.
Even while shooting in RAW, you can set your viewfinder to show monochrome previews. This way, you can adjust your camera settings and composition to get the best-looking black-and-white image you can, while capturing all the color data present in the scene. Turning on a highlight warning is also a good practice. You’ll be able to see where any data is being blown out and lost due to brightness.
No matter what you’re photographing, your other camera settings depend on the conditions of your environment. Based on how strong your light sources are and whether or not your subject is moving — you’ll adjust your camera’s ISO, aperture, and shutter speed to get your ideal image. ISO determines how sensitive to light your camera sensor is, aperture determines the size of the opening that lets light into your camera, and shutter speed determines how long your shutter stays open.