Using ChessBase and its cbh format would be a good start for a book which mainly contains annotated games. Since you own CB version 12, no need to discuss the stability of older versions. I am using both CB 8 (it almost never crashes) and CB 11. Remember to back-up. 

If you have a possible publisher in mind, take a careful look at a book from that house which comes close to your project. There are editors who expect a bibliography and crediting the sources. It wouldn't hurt to contact that publisher at a certain point, and rather a bit early than too late. Based on a sample chapter, he/they might be willing to discuss a possible contract. You might be surprised to hear about the financial conditions. 

If an e-book or self-publishing is an option, consider PagePlus X7, to refine the cbh file into a more professional publication. PagePlus has some abilities to create works in e-publishing formats.

Of course, then those Word files have to be converted to camera-ready documents.  But at least one major chess book publisher uses Word for the whole process.. no InDesign or Quark (do people still use Quark?) required.

Hello. I am considering writing up a draft of a book, and I would be very grateful if some of the posters here who are published authors can advise me on what tools they use to create manuscripts.

In particular, I would like to know whether it is feasible to use ChessBase for this purpose. I have ChessBase 12. The book under consideration would mostly be in the form of annotated games. There might be an e-book in addition to a printed version.

Thanks,
ReneDescartes