The best way to learn how to mix complex colours is trial-and-error (in my opinion) - you see how colours turn out when you mix them while painting. Keep in mind that acrilicacrylic does not support mixing as well as oil, tempera, watercolours and the like.
You could also analyse colours digitally - most graphic applications show what is the value of each primary colour a particular colour consists of. It sounds like what you are looking for but I don't think it will actually be very useful in practice.
