The best directions for setting up a wall mount flat screen tv should come with the tv that you purchased. If the instructions are missing, you could visit the manufacturer's website to find them.
Amazon does sell flat screen TV mounts but it would depend on what manufacturer of television you had brought from that would determine whether you would be able to get one that you require.
To wall mount a flat screen tv, you will need a power drill, measuring tape, a level, a pencil, and possibly a stud finder and a screwdriver, and you should really have a wall mount kit as well. A...
The better you can mount a flat screen TV, the better for your TV. Hitting the wall studs is always a preferred choice. Just hanging a set through the dry wall or plaster is inviting a catastrophe...