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Turnout the lights at night. Get a powerful, bright led flashlight with an adjustable beam. Narrow the beam. Sweep the room and look for reflections from a lense that doesn't belong on the object such as a picture frame, bookshelf, or some other object. The reflection will be a bright dot on the object.
RF bugs require some more complex equipment for detection; but, you can usually find what you need at a good electronics store. If you get a RF signal detector, be sure to get a digital/analog select switch , a sensitivity tuner, silent detection, earphone jack and a led alarm. It will make the job easier.
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