opening sentence for my story

Hello there readers we are learning to write an interesting first sentence to hook our reader.

 My first sentence is The boy plays a game flashing light  gun shot pew pew bang pow the boy was focus on the game.That is my improved sentence my sentence updated is my puppy play fetch at the backyard the boy throw the red ball the puppy chase after it and levt happily ever after THE END.One more thing my boring sentence is One dark day the boy was focus playing a video game.