From here you just need to position the camera, lights, and background perfectly. Interviews look great if you follow the three point lighting set-up, which keeps one light on the short side of their face, one on the back of their head, and one on the background. If possible keep a white reflecting card somewhat close to the long side of their face to soften the image up. You want to keep the camera around six feet from them, but keep them as far as possible from the background. This can be difficult in limited space, so you have to be creative. Try positioning the camera in doorways or in other rooms to get more distance between the subject and the background.