If you are looking for a written strategy guide (a "paper" on how to win the campaign), the community produces "AARs" (After Action Reports) which serve as case studies.
As you begin your campaign, your kingdom is at peace with its neighbors, but the rumblings of war are growing louder. The Empire, under Otto IV, is tightening its grip on the surrounding territories, and King Philip II of France is making aggressive overtures towards your borders. total war attila mod medieval kingdoms 1212 ad campaign link