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One does not usually force himself to see a ghost, but I'll offer my good advice.
Like the good people above me, you'll need to find somewhere active. You may not be living near somewhere that is historically haunted though, so improvise. Do you have a friend who lives near a graveyard, do you know a place where people died, perhaps your own house? Look up the history of your own house.
If all else fails, travel somewhere that is historic. Bring a camera, like has been discussed. Ask the locals for more active places than others.
Finally night. Notice everything. All movement. Turn out all the lights. Be aware of all of your senses. One sound will disturb the ghost if there exists one.
Like the age old saying, if you fail, try try again. You're gaurenteed to find something.
Good luck!