Tim Rudman's book is certainly the most indepth book. Discusses all the processes plus more than you thought you needed to know. There are a couple of others that will give you some basics Toning and Handcoloring photographs by TOny Worobiec, Toning Techniques for photographic prints by RIchard Newman.


The warmtone papers will shift to interesting colors, so if you do not want that to happen you will need to change papers, or use Sistan.
Anyway TIm covers all this and more.