what is ball park cost to install a 65 inch tv on the wall. what is cost of the bracket.

You can get a bracket for about 40 to $50. Only takes about 20 minutes to install very easy

Well i would do it through amazon services to be honest. They did my 65 inch for 130 and that included the cord management bracket behind the wall. You will have to buy your own mount though and they are also very reasonable. To be clear you dont have to buy the tv through them to buy the service and it is guaranteed by amazon.