Check this thread.
If you pressurize at the inlet, you should disconnect the line to the evap solenoid,and the breathers and plug them off. You can also disconnect a hose off the tube off the turbo if you are running a fmic.
here is my tester made of home depot parts and some spare silicone couplers laying around.
These are designed to go into an air compressor.
You can also use a plastic cap and drill a whole for a valve stem to go in it and pump it up with a tire pump if that is all you have.
Most leaks will show by 10 PSI or so, and if there is a boost leak it won't hold pressure at all, you will also hear hissing from the leak. It is normal for the car to hold for about 15 seconds or so. Also don't worry about leaks you find in the joints of the pcv and breather systems, they are not designed to handle boost and will never see boost in daily operation.