Minecraft wiki entry for Creating_a_village, associated text: If one wants to get more villagers (and get a blacksmith, just place their job site block; smithing table for toolsmith, blast furnace for armorer and grindstone for weaponsmith), one can repeatedly add in more houses to let the villagers breed more and make more villagers. Also, if the villagers are gossiping a lot, an iron golem can spawn, which can be an aid in defense or a source of iron.