I suppose this is in danger of being a plug, because Harry Bingham is a colleague, and I've got a little piece in it myself, but I've just been read his new book,
The WAAYB Guide to Getting Published, from cover to cover, and it's absolutely terrrific.
Harry gives you not only detailed, readable, practical, knowledgeable and often funny advice on everything to do with getting to that book contract, but also about life afterwards. Indeed, he has quite a mission to explain all the things that the book trade can't or won't tell authors, or doesn't remember that you won't know. So it's not just for the aspirers, but for all of us who at least want to know more about what's happening to our work, and possibly do something about it.
Emma
<Added>I hasten to add that it isn't a plug in the sense that my little piece has made me any money.