There are two ways to present an adventure hook to a group of PCs. The GM can set things up in a narrative fashion, describing the quest out of character, or the GM can use an NPC to deliver a situation in-character that requires a response from the PCs. While the first works fine, the second is more immersive and gets the players into an adventure frame of mind more directly.
GM: Okay, um... It's the evening of the day after Princess and Han's wedding, and they've left on their honeymoon. The rest of you are still on the forest moon of Endor.
GM: The Ewoc Wicket approaches with some news.
Wicket: Lo, friends! I have some news!
C-3PO: What is it, pray tell?
Wicket: My friend Deej has found a crashed starcruiser belonging to a human family. But there are only children there, no adults.
Luke: You want us to help find the adults?
Wicket: Yes, they have more purchasing power.