This is where you come in. Recently you've been having portent dreams of a threat that only you can face, and they've brought you to the graveyard out the back of the Temple in Angelfall. Who are you? Do you live in Angelfall, or are you a traveller? What form have those dreams been taking?
Create a Level 1 D&D 5th Ed character - I highly recommend the Character Builder here https://www.dndbeyond.com/characters/builder#/, then add a short bio here for what you look like, name, and pronouns.