The competitor analysis first
Whenever I need to get my head around a new presentation I often start with scribbling a map of competitors and the differentiation that my client has versus them. The result is a messy table full of scribbles which is definitely not the right end product to put in a presentation.
It informs however the whole story. Now that everything is on a piece of paper in front of you, you can start to think about what story you need to convey all this information.
Most management consultants stop at the busy table. That is the end of the analysis and the beginning of the presentation design.