Gold is the most important thing in healing your troops in KE, that's why I am so eager to upgrade Jarvis's skill which could reduce the amount of gold needed to heal. Waiting for gold production from your villagers is not very much, so you have to think of other ways to fork out money.
Watch out for commodity price at the marketplace. Food always sold the most expensive.
It is good to win some food (Winds of fortune ia a stone that grants food) from events!