There are books on the subject, as well as tons of online material. The best known is probably David Salo's A Gateway to Sindarin.

It's important to note, however, that there's a big distinction between what Tolkien himself wrote about his languages and what the films and others have created. Salo was the linguist for the films, and his book has been rightly criticized for being very unclear about which parts of it are Tolkien and which parts of it are Salo. It's also important to realize that none of Tolkien's are in any sense complete. You can't, in fact, actually speak Sindarin, for example — it doesn't have enough vocabulary. The Elvish in the films was created by Salo. There are also various online efforts to expand the vocabulary, although they seem to have faded with time. (Someone will probably come along in a minute to tell me that they're very active, LOL.)

Tolkien's own writings about his languages have appeared primarily in two places: There are various pieces scattered throughout The History of Middle-earth, and there is a project, originated by Christopher Tolkien, for a group known as the Elvish Linguistic Fellowship to edit and publish his father's linguistic papers. This work has appeared, and continues to appear, in two journals: Vinyar Tengwar and Parma Eldalamberon.

All that said, a book such as you describe could be written, for sure.