Workers
Workers are the backbone of your kingdom. They provide the vast majority of your income, and contribute largely to your score. Workers must be trained to gather a specific resource before they can provide an income, however, and this costs more and more as your total of trained workers increases. From the "Workers" page you can choose the number of each type of worker to train, and see in advance how much it will cost to train them. Eventually it will become nescessary to take workers from enemy kingdoms (see Units: slavers). To begin with, simply recruiting workers from within your own kingdom will be cheap enough. See Missions: recruit workers.