Villagers are essential to let your town thrive with life. They also let you unlock certain items to help you progress throughout the game.
Before a villager can move in, he has to be spoken to at Oma the Inn. The villagers appear there between 11 -14 a. 17-21.
In order to let the villagers move in you will need to build a house for them. The house must contain a bed and a light source. You can build the two objects at Sally's Workshop and then place them in the house. You can use a Futon for the bed or a Paper Lantern as the light source.