Rules compendium 2: Scenarios, maps and travel
Determine the size of your scenario map. At least 6x6 squares is recommended. Fill in terrain, enemies and other elements as appropriate. If a square is left blank then assume it is empty with open terrain.
Several scenario maps can be linked. One scenario map represents one square on the campaign map. Moving one square on the scenario map takes one round. On the campaign map it takes one day.
Errata: After each session, you receive an experience point (xp). Buying a new Skill costs 2 xp, one point of Health 1 xp and increases to Attack, Defence and Action its current value.