You can say something like this:
"Hey there, have you ever wonderd about sharks"
or
"Do you wish to visit the magicial world of sharks?The come with me!"
Creating a setting in these stories can also hook a reader so, you can do something like this to hook your reader:
"In the deep blue ocean, there are blue fish read fish, even rainbow fish.Swimming around the coral reef with my shark buddies, looking for something to eat."
or
"I was on the beach, listening to the crashing waves and the loud screach of the seaguls flying by."
These create a setting which can hook your reader to the story.
Remember while wrighting make sure to add characters, and a setting.
