Creating a website book out of your current MS Word file is very simple. All you have to do is to save the entire book in .html format –one of the options in MS Word. You may even wish to save each chapter as a separate .html page and then alter the table of contents to provide links to each of the chapter-pages.
When creating the website from your MS Word document file, it is wise to make as little change as possible to the website format as when you update the MS Word document you will also wish to re-save your website version. Fully document how you turned the MS Word document into the website version so that you can follow exactly the same process when you update the MS Word document to obtain the new website versioin.