This book, by James Gurney (creator of Dinotopia) is the book I recommend to any of my students who are thinking about tackling color - especially if they are moving on to acrylic or oil painting. It has some sections that are helpful even if you're working in graphite or another black/white medium. This is a pretty thorough book, that will help you get into the mindset of an artist, and I recommend it even if you are attending art school- because it goes into specifics on issues that often are covered in more commercial artistry than academic art settings. You can pick up a copy here, or many other online retailers: https://amzn.to/2Jdexsw