With the car charged with freon, yours should be 2 lbs but check the under hood label.
With car off, take a spray bottle with water and dish soap and spray down the complete A/C system. Mostly check the compressor body as this is the most common place for leaks, also the condensor.
Do not use any of the leak sealer because if you have to open the system at any point the sealer will cause you many headaches as the sealer will harden and plug things up.
Better to find the leak, repair the issue and while system is open you should change the orfice tube and the accumulator drier, Vaccum system really good then recharge to appropriate ounce'* of freon and oil.
I use nitrogen to pressureize the system to check for leaks, works great.