Three Kingdoms: from Jiange Instructor to Chaotang Military Advisor

My name is Lin Yuance, a village instructor outside Jiange City. I am originally from the market. One day, he rescued a deserter from the Wei army on a mountain road and unexpectedly received a military book. When I opened the first volume, I was shocked by the exquisite strategies and profound insights. At that time, the Wei army's 200,000 cavalry were pressing down on the territory, and the sword pavilion was in danger. What can I do with this book in hand?