Simple, but complete 2 mission campaign:
1 mission to fly, 1 mission on success, 1 mission on failure.
(In fact, these are just the three last missions from the original "Cliffs Of Dover" campaign)
This demonstrates the
- Folder and file structure
- How to fork to next mission based on success or failure
This may serve as an example for building your own campaigns.
Also read the section on campaigns in the Mission Builder's Manual