Step 1. Enter main message of presentation as main idea of mind map.

Step 2. Add some key points of presentation as top-level topics — they will be organized as different slides.

Step 3. For every top-level topic add some key statements as subtopics — they will reflect slides messages.

Step 4. Continue steps 2-3 presentation structure to become complete(integrated).

Step 5. Read presentation structure to oneself to check that structure is ready and nothing is missing.

Step 6. Add key notes for topics and subtopics, note must disclosure topics sense.

Result. Now you have structured plan of future presentation.