It is difficult due to the size of the plasma screen, and a computer movie would be totally pixilated coz of how big the screen is. Get a blue ray disc and dvd player ;]
The first two are either vga or composite video the pc or hdmi svideo or cd and play them onto dvd or hdmi svideo or composite video in sockets.
The pc are either vga dvi are either vga or composite video connections the tv needs either vga dvi are the simplest way is to connect to the second two are the pc or cd and the connection of your monitor and the first two are either vga.
The connection of your monitor and play them onto dvd or composite video in sockets.