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No...an aquarium pump will not do.
For external mix airbrushes, the small air cans are quite suitable.
They're cheap, portable, and quiet.
But you can easily go through a lot of them if you get carried away with the airbrushing.
Generally, scale model airbrushing is light work.
You aren't going to spray a lot.
And you aren't going to spray for very long.
Once you get the hang of setting the spray on the airbrush,
its just a quick blast of paint in the right direction or through a stencil or masking.
As Sgoti indicated...double action, internal mix airbrushes are the big step up
and offer more control for artists.
They also require a better compressed air source and a lot more training.
There are much better single action external mix airbrushes.
I don't know how good the Testors model is.
It looks to be a "cheap" tool.
But it was designed to do something...maybe not a lot...but something.
If you don't expect too much, you won't be disappointed.
I have applied paint via airbrush to paper models.
You need to go slow...apply as little paint as possible with each spray or pass of the airbrush.
It is very easy to wet the surface, wet the paper, and ruin your model.
You also want to use lightweight, thin paints and inks that will atomize easily and dry quickly.
If atomized properly, the paint literally dries before it even hits the surface.
You'll find the airbrush handy for adding subtle shading and surface effect.
If your model has been puttied, primered, etc... the airbrush can be used for just about any type of painting on it.
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