I am trying to create a book and I am OVERWHELMED

I have lots of photos, facts, oral histories. Every time I try to think about creating layouts, I get stuck or fall down a rabbit hole. Ill spend 3 hours working on it and not having even a 2 page spread bc I stopped to search somethjng, poof the afternoon is gone. At this rate I'll never get it done, worst case scenario is me kicking bucket and just leaving a pile of papers.

I have info going back to my father's great grandfather. Should I start there or should I start with my father, on whom I have the most detail, oral history and visuals. Also, this book is primarily for my child, his only grandchild. My child only knew his grandfather.

Should I just start the story as far back as I can or should I start it with the person he knew? And put the elders in an appendix.