Anyone who wants to start screenwriting should first read this book. If you've already been screenwriting for a while and you've been having a lot of success then you probably won't need it. I started screenwriting last year, but I not only have trouble with format I also have trouble with connecting all three acts sometimes. However, this book has solved many, if not all, of my problems with screenwriting.
I didn't get hooked until Chapter 6-7 when Schellhardt began discussing how to plot the beginning, middles, and endings. Form that page and onward I found its contents to be most helpful. As for the beginning it was a bit slow and very generic for me, but I am sure it will be most helpful to those who haven't screenwritten before.
Jaws, The Untouchables, and American Beauty function as the best example of the screenwriting format they follow. You can learn a lot from them, and Schellhardt guides you through most of them. She also offers insights and advice on how to overcome Writer's Block, as well as how many times to re-edit your manuscript and how to go on to doing that several times without losing your mind.
This manual will also teach you how to adapt a book to screen and how to own the copyrights for that. I don't think you can find any other book that covers so much information all together in one book.
Screenwriting for Dummies does concentrate more on producing film rather than just tv shows, but if you can use these screenwriting guidelines for film and apply them to your tv script, then I'm sure that every episode will be as good as watching a movie. Good luck!