Of course, there are hundreds upon hundreds of books in print on Zen, but these are some of my favorites, titles that I always recommend to people starting out:
Other recommended titles:
I should of course point out that the whole purpose of Zen is to go beyond limited notions. Books and words are, as they say, a "finger pointing to the moon," not the moon itself. To get a real sense of Zen practice you have to do it. Simple online instructions for Zen meditation can be found here.
For Dogen Zenji's own instructions, please click here.