There are a lot of questions that newbie DM ask, some of the more common mentioned already in this thread. I am curious, what is the focus of your book or put another way what is it supposed to achive that the DMG or D&D for Dummies does not.
Now I am not too familiar with the for Dummies books, I had a brief look at hte 3e version a couple of years ago and it seemed to touch all the correnct bases, I think that the 4e DMG is pretty good for newbies and coveres the player management, encounter creation, and so forth. However, something that covers world building, campaing creation with examples could be very useful to a newbie.
Now I am not too familiar with the for Dummies books, I had a brief look at hte 3e version a couple of years ago and it seemed to touch all the correnct bases, I think that the 4e DMG is pretty good for newbies and coveres the player management, encounter creation, and so forth. However, something that covers world building, campaing creation with examples could be very useful to a newbie.