Ruby is an NPC of the Val race. She is first met at your farm when you try to cross the bridge for the first time. She is the blacksmith of the town and owns a shop, selling helmets and such.
After the first dialogue you will receive quests from Ruby in your letterbox. A bird sitting on the letterbox indicates that a new quest is available.
First Quest: collect four timber.
Second Quest: use Mine I to collect enough stone to build a furnace.
Third Quest: start to fish. You will need a Fishing Rod, a Lure and Fishing Bait for fishing.