War Will: Lord of Chaos

This world's kingdom is aristocratic and politically corrupt. There are many families in this world, and everything is waiting for prosperity. The world is in chaos with the rise of alien races. What should an ordinary uncle do if he travels to another world? What should I do if I don't know how to lead troops? I am a game master and can arrange troops and formations! What should I do if I don't know how to use power? I am the president of the guild and can make plans! What to do if you don't have the strength? I'm a programmer and I'm stuck, so what's the point of my strength? Or agile? Forget about physical strength~ The most important thing for the elderly is durability!