There is no single format for books; there are many, and which you choose
depends on what sort of book you intend to write.

Further, if you plan to submit your work to commercial publishers, most of them
don't want you to do any kind of formatting except that which they specify.
Contact a few of them and ask for their manuscript guidelines.

For some hints and links to using Word to create a book-length manuscript, see
http://daiya.mvps.org/bookword.htm.

--
Regards,
Jay Freedman
Microsoft Word MVP        FAQ: http://word.mvps.org
Email cannot be acknowledged; please post all follow-ups to the newsgroup so all may benefit.

See the "So You Want to Write a Book in Word" article on fellow MVP Daiya
Mitchell's website at:

http://daiya.mvps.org/bookword.htm