Hail, Sir Knight!
The King has bequeathed unto thee royal lands as reward for thy faithful service. However, these lands are untamed, with its subjects rejecting thy rule as if they weren't a part of the kingdom. As a faithful vassal of thy lord, take up thy sword and conquer these lands and bring them under thy rule, as is thy right!
Develop your holdings by managing resources and buildings. Each building has a purpose that unlocks greater advantages for your town and for your campaign, whether if it's a simple house for your peasant populations, or a grand marketplace to open up a town to trade and resources that are otherwise not available in the town. Construct walls and defenses to defend your holdings from invaders and develop them in order to bring more resources and manpower for your campaign.
Improve your own skill as a knight and upgrade your equipment as you progress through your journey as a knight. Whether it be improving your personal martial skills, or increasing your ability to lead bigger retinues, investing in your knight will allow you greater power and ability to conquer other lands.
You'll need soldiers if you want to destroy anything larger than a bandit group. Levy from your peasant population a basic army, though at the cost of not being able to put them to work, and lead them in battle against enemy forces. Different units are strong or weak against varying enemy types, so choose your army well. With more development and resources, you may even recruit professional soldiers that are superior to the levies, and don't take away from the labor pool, although their cost is higher than a simple peasant recruit.
Sometimes, or rather all the time, it's more fun to play with friends.
Bring your fellow knights into your game to assist you!
Divide up your holdings among your friends, who can in turn help you manage your realm as it grows, and assist you in battle with their own armies!
Conquer the realm with your knight friends!
