This is another useful book that includes basic information on painting.
http://www.evergreenscalemodels.com/Book.htm
There are samples from various chapters at that site. It is easy to find on ebay. Basically as soon as you progress beyond basic sanding and drilling of the ABS plastic chassis of RTR cars into building braces etc or hardbody 1/24 cars you will find this a pretty useful book. It's not much help for resin bodies though.
It might be all some people need. It covers most bases when it comes to styrene models.