Money is an important element of the game. Together with stone and iron they are spent on upgrading buildings. Moreover, you can use the money to buy goods or to recruit military units. The state of your finances is also affected by the amount of constructed buildings. Each constructed building has a yearly maintenance cost. You can check the amount by clicking on the given building. As a result, it is important to secure a steady source of financing.
To gain money, you need to create a trading post. You can hire traders that will generate a certain amount of Kröwns. Moreover, you'll be able to open trade routes to trade with other clans, which is also a source of additional money. The amount of money generated increases with each constructed post.
To open up a trade route, click on a trading post and choose "start a trade route" A menu will open that enable you to choose the type of the resource  and a list of potential clients . Each offers different price for the good. Kobolds are one of the best trading partners - if you encounter them during the game, be sure to create some trade routes between both parties.
Moreover, you can increase the amount of generated money by developing the trade tree. Some of the bonuses enable you to increase your profits, for example, Clan of the Wolf has access to a bonus that gives 15 Kröwns for every enemy killed outside of your territory.