To start the player with a quest:
In the Quest Editor window, set the quest state to Active. Inspect the player's Quest Journal component and add the quest to its Quests list.
Alternatively, create an empty GameObject. Add a Quest Giver component, and assign the quest to its Quests list. Add a Timed Event component. Configure the OnTimeReached() event to call QuestGiver.GiveAllQuestsToQuester("Player").