A/C low side is on the passenger side, right next to the strut tower.
When buying refridgerant, unless you have replaced your compressor, don't buy any with oil in it. Too much oil in the system will cause your A/C system to fail.
In regards to leak sealant, be careful, this stuff can also cause things to seize if too much is used. So if I were you, I'd buy a large can of just pure refridgerant and a second smaller can with sealant. Use only a small amount of the sealant can and refill the rest with your larger refridgerant only.