There is an excellent template in the Microsoft Templates Gallery site. It is mainly set up for manuals and is an administrative style sheet guide also but can be very easily modified for ebooks. It has a title page, contents page, chapters set up with headers, and a index. I found the information on style was also helpful in outlining a document.
Here is the link: http://search.officeupdate.microsoft.com/TemplateGallery/ct148.asp
Hope this helps. :>)