Upgrade your plots to the maximum level to get as much food produced as possible.
Gears
Gears are produced by the Fallen Satellite building. Only one gear is produced per day. Gears will be required to upgrade the warehouse.
Keys
Complete the Totem quests to receive a key as the reward. Complete any task that has a key listed as a possible reward. Farm those tasks to eventually get keys.
Resources
Clear grass and other debris to stock resources that will eventually be needed. If you have too much, you can sell the excess for coins.
Upgrades
Uprade your passive resource producing buildings, such as houses, first. You will get more resources from them. Eventually get all buildings upgraded as much as possible.
Villagers
You start with four villagers on the island. You can only get one more. To find him, explore until you find the pyramid. Somewhere nearby is a person trapped in a spider web. Free them to get your fifth villager.