You need to take your car to an air conditioning specialist, one who actually knows what they are doing, who would explain the entire process to you whilst it is carried out.
The chances are the condenser is missing 50% of its cooling fins, you cant see this until it is removed from the vehicle, then the gas needs to be removed and weighed then adjusted before adding it back into a fully well evacuated system, together with specialist oil to lube the compressor and the seals, these need to be replaced as needed.
The system then needs to be ran to check for leaks (UV dye added), and that it actually cools the interior of system as intended, then you pay the guy and go on your way, a happy chap/chapess!.
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