Hi there, Russell here. I think that the Testors line of acrylic paints, called Model Master Acryl is a very good choice for you. Acrylic paints clean up easily, airbrush easily (at least that has been my experience) and they are "healthier" for you in that they are non-toxic. If you spray in an indoor environment I would recommend getting an organic vapors paint mask just for a bit extra protection.
An airbrush is a wonderful tool for model building. I have been using the Testors made Aztek line of airbrushes for about 14 years now with great success, I think.
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If you choose to get an airbrush, look seriously at that line, they are easy to use and give pretty good results. Take a look at my gallery which is the photos button on the top of this post and check out the kits I built with the Aztek. It will give you some idea of what kind of results you can get with a little bit of practice.
As to primers, I often do use a dark green or grey primer. It doesn't have to be specifically for priming, it can be just a dark grey color or green as I mentioned. It is useful in that is gives you a look at how the mode looks with paint on it. Also, it allows you to check out any seam work you have done and see how well you have completed that task on your kit.
If you have any questions, just ask, this is a great forum from all over the world for help. Hope this helps you a bit. Take care, Happy modeling. Russell