Do you have a manifold gauge? If you don't, you need one or take it to an A/C shop. It depends on the type of system you have as to what the low side pressure should be. 10 to 12 psi would not be bad for a thermostatic switch system with a thermal expansion valve (TXV). A plugged expansion valve will pull the low side low or into a vacuum. The high side will be low as well. That may sound backwards, but that's how it works.
I take it you added refrigerant and it still isn't cold? Another thing is air in the system is like letting the ice cubes melt in your Iced Tea. Air dilutes the refrigerant. If you put the proper amount of refrigerant in the system with air, the pressures will be high on both sides.
Best thing that can be done is recover the system, evacuate, and recharge the correct amount. Right now, you can look for leaks with a soapy water solution. If there is grease buildup on the compressor, good chance the compressor shaft seal or a case seal is leaking. If you don't have acess to a vacuum pump, you won't be able to recharge it.
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