Hello, generally if the AC doesn't work it's because there is not enough refrigerant, if you don't have the necessary equipment then what you can do is to verify it visually, there is port located in the engine compartment where mechanics use to recharge your car with refrigerant, remove the cap and push a screwdriver inside the port, if you don't see any gas coming out then you don't have refrigerant inside the ac circuit.
This procedure is very easy to perform, it's like removing air from a tire, but ***DO NOT INHALE*** the gas coming out, just a quick tap.
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Cars can lose refrigerant if you don't use it for a long period but that doesn't mean you have a leak.