You're the new neighbours next door to the dursleys, Your 15 and live alone.

Your not a wizard like Harry, But you have abilitys, to make or do anything you want, for example, Making a fire appear in your hand

you haven't met The Dursleys yet, There's Petunia Dursley, Vernon Dursley, Dudley Dursley and Harry Potter (Their nephew/ Cousin)

About 4 days after moving in, there's a knock on your door, you answer it and it's The Dursleys