I've recently started working on a new company history project. I've conducted interviews with about 20 people and had those interviews transcribed. I've also been provided with a number of newspaper articles and other items from the archives. All up I have about 200,000 words of raw material that needs to be condensed down to about one tenth of that for the final book.
At the moment I don't have a clear idea of what the finished product is going to look like structurally. I have some major headings in mind, but what order they will be presented in is unknown. And those topics may change too. There might be a few 'ins' and 'outs' along the way.
But that's okay. What I've learnt over the years is that uncertainty at this stage of a book project, or any large creative project for that matter, is quite normal.