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Mount 55 inch TV to wall

Hi I’m looking for a quote to mount a TV to a wall. The TV is a 55 inch and I already have the mounting bracket. It is a 70’s home with standard timber framing. Looking for a firm quote for this from someone who has done this before. I’d prefer the wires to be concealed behind the wall too, by making a hole behind where the tv will be and bringing the wires out down at floor level. There are no nogs between these 2 areas and no insulation in the wall. Please do not reply unless a quoted cost is included. Pic for reference only. Thanks.