Hogzilla
Since you said you won't be starting your job for another 2 months it might be best to be patient and persistent for now. Holding off on spending your cash on anything that is not a necessity until your getting regular pay checks??
Welcome to this form.
Personally, I think the above is the best advice for you right here. YOu're asking to do something even half correctly, but for a budget that won't really allow it. What if you do get into it, but find out that what you're using is completely inadequate; personally this would be a big determining factor on whether you do stay in it or not.
The harbor freight air compressor plus airbrush really is your best bet. For a bit of time, I'd stick with using rattle cans, since that will be cheap, and brush-painting the interiors. I did that for years when I was building car kits. Then go for something like the link provided above, which will be a solid performer for a basic setup, will last, and won't give you any frustrations with performance.
Using tires, air tanks, finding regulators, custom fittings, blah blah blah, you still end up spending half if not your whole budget, and if it turns out you do like it, very soon you will want to upgrade anyways.
Save your money, do what you can now, and get a half-decent setup for the $70 posted above when you can.