hey there I know whats its like to start out as i've been building for 4 years now..
here is a trick I used.. I decided how much to spend each week on the hobby when I started and didnt' have any tools.. I sit aside $20 each week and if I went to the hobby shop that week I bought a tool or two or some paint I would need... eventually when I got a nice bit of stuff to work with I just saved up my weeks budget untill I could buy a compressor and airbrush..
It took me about a year to get just about everything I needed and then some... but its a good way to start without blowing your paychecks all at once...