I have a panasonic viera plasma tv model number TC-P60U50, where on tv do I put brackets to mount to the wall?

You will need to purchase a suitable wall mount separately. (You'll need one for LARGE TVs.) On the back of your TV set you'll see there are 4 holes in the lower-central region of the rear panel. They are about 20" apart (left-right) and about 12" apart (up-down) These should match up with the bracket that comes with your wall mount. You will need M8 metric screws that are about 1.25" long. These will also be included with the wall mount. (Which will include some general directions for wall mounting.)

Here is a manual for your TV:

PANASONIC Viera TC P60U50 Owner Manual Page 7