Ah, there are plenty of good articles on working with acrylics; the best I've seen is this: Painting figures with model color.
An excellent article by an excellent artist; it covers in short and comprehensive form everything from the very start to the more complex techniques.
However, it is worth to notice, that it is very, very hard to paint models of any real size with brushes; and it is very, very simple to do the same with an airbrush. Unless your subject is meant to be noticeable hand-painted, or of extremely complex shape (like figures), the results will be by far better with an airbrush.
A very good airbrush (not just for beginners!) costs $70 here, plus $10-$20 for accessories, plus, say, $50 for a compressor - you don't need an expensive hobby compressor at all; general purpose compressor with a tank from a hadrware or department store will satisfy absolutely all your needs; in my opinion, they are by far superior to any hobby compressor; however, it depends on 1) if you have a place for a compressor in your home and 2) if compressors in your department store are silent or loud. Germany-made cheap compressors around here are relatively silent; they just murmur a bit when working.
For $150 you can get a very professional airbrush with a compressor, which will see you through a lifetime. :)