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Find a mirror that's the right size, like a full-length one for a full body selfie. Clean up the room that's visible in the mirror if possible. Find a spot that has good natural lighting or that is well-lit.
Pick a mirror that's big enough to fit as much of you in the shot as you want. For instance, a small wall mirror works if you just want a selfie of your face, whereas you need a taller mirror if you want a picture of your whole body. Keep in mind that you can crop your selfies, too. If you just want your face in the picture, but you only have a giant wall mirror, crop the rest of your body out of the photo after you take it. If you're taking your selfie in your bedroom or your own house, make sure the space that will be showing in the picture is organized and clean. For example, put away any dirty clothes on the floor, make your bed, and check that anything potentially embarrassing, like your life-sized celebrity crush poster, is hidden. Natural lighting is the most flattering for pictures. To take advantage of this, open the blinds or curtains on windows to allow more light in and try to take your picture during the day when it's sunny outside. If it's nighttime, recreate natural lighting by turning on soft, warm lamps instead of bright overhead lights. Avoid fluorescent or harsh white lights which dull your skin. Make sure that the light isn't directly at your back. Otherwise, you'll just be a silhouette. Adjust the light if possible so that it hits you in the front.