OK
@Susi as promised I made a couple of photos of my set up to help you understand what you should be doing.
In this photo you see my compressor, a similar type to yours but bigger, the compressor is sitting on a box covered in foam top and bottom, the purpose of the box is to eliminate noise due to vibration so that my neighbors have no problem with it, the noise the compressor makes isn't an issue.
I have (again) numbered all the main Items needed which are;
1) compressor hose.
2) Your regulator/water filter.
3)Airbrush hose (you already have this).
4) already on your compressor this tell you what pressure in in the tank and 5) lets you adjust the output pressure by turning the red knob on top, I have mine set at 3 psi and make further adjustments as needed form the part 2) at my desk.
In this photo you can see all the components disconnected, notice the difference in thickness of the blue (compressor) hose and the black (airbrush) hose, the compressor hose is fitted with a 1/4 male quick connect to go onto the compressor and a female quick connect same as on the compressor itself.
Part 1) pushes into the female quick connect already on your compressor,
part 2) pushes onto part 3) which is the same as part 1) you shouldn't connect these parts until your airbrush is connected, you already have part 3) which you will screw into your regulator when it comes.
Part 4) is a 1/4 male to 1/8 male reducer which you will attach your airbrush hose to via part 5), part 4) will be included the in the box when your regulator comes, you simply screw that into the side that says "OUT" whereas part 3) is screwed into the side that says "IN"
I hope you fully understand this now, but to recap you need in the following in the order you see them;
A compressor-----a compressor hose------to a pressure regulator/water filter------an airbrush hose-----an airbrush, what could be simpler
