Query on ebooks for law firm (and other) marketing

Over the years, I have ghostwritten more than 15 comprehensive books on a wide range of legal and business subjects.  I recently persuaded a new client to go the ebook (rather than hard copy) route.  She liked the idea -- and now I must "walk the talk" by familiarizing myself with the process, including ebook compiler software.  Based on preliminary research, it looks like folks write in Word, transfer to PDF and then upload to a compiler.  Is this correct?  Any recommendations on process as well as ebook compiler software would be welcome.  Is there any software that lets you compose and publish in the same package?

Writing samples: Books

In addition to writing articles, white papers and other marketing materials, Janet Ellen Raasch has also written and ghostwritten more than a dozen books.  Projects of this length are significant and require -- in addition to good writing skills -- extensive organizational, research and interview skills.  She has written more than a dozen corporate histories and numerous books on legal subjects.

Many of the books she has written are comprehensive corporate histories in a wide range of industries that were published by corporate clients and list Janet Ellen Raasch as author; some of these are excerpted below.  Books ghostwritten in collaboration with a lawyer or another professional service provider are published under the name of the author -- who takes full credit for the book.  To protect the identity of the authors, there are no samples of this work.