You can buy all the necessary fixtures at your local hardware store.
How To Put Tv Wires In The Wall. If you are mounting your tv on an exterior wall (the other side of the wall is the great outdoors) you will probably have to push through insulation to. Easy way to fish wires in wall & locate studs.
How to hide TV cables in the wall - low voltage HDMI CAT5 ... from i.ytimg.com
That way, any time you want to change the position of the tv, you can point it for optimum viewing from any seat in the room. You can also disguise speaker wire. I have the tv and wall mount here but i'm extremely apprehensive about a plastic sleeve running from above post:
Looking to hide your tv wires and cable box.
World's most powerful binoculars put you right in the action. Install a raceway and paint it the same color as the wall. If it isn't, then do the same thing with the wall plate. Push the left side in first to make the right side fit nicely.