One lesson I have learned about making short documentaries is that the story comes first. First you do your research and write out the audio lines and then record the narration. After that you build the graphics around the narration audio. Then you polish off the animations and play it through a few times to find mistakes. I tried to make a feature length 90 minute movie about amazing things in the past but it was messy and unplanned so the project failed.
The planing and story always comes first. If I do make an "Alanasis" 90 minute movie I will make it 15 minutes at a time and follow a plan. Then I would stitch the 6 videos together in the editor. It is on the bucket list.