Hi artygirl,
My sister and I worked on a book together, we self-published.
We were covering one of our lines, Wild family, but focused on one of them, Thomas Wild, as he came to Australia and is our main ancestor here.
So, what we did was, apart from the standard: contents, acknowledgements, introduction page etc. divide it into sections.
Part 1 - English Ancestry
Part 2 - Emigration and colonization
Part 3 - Descendants
Then at the end, source, bibliography and Index.
We included maps, photos (they add on the cost but cheaper if grouped together), family charts etc.
attached is the cover of our book, I did a pastel painting, which showed a portrait of Thomas, with the background of the Murray River where they had settled (think of the movie all the Rivers Run

)
I am now planning my next one, in a totally different approach, more complex, but having a lot of fun thinking about the cover

Margaret