Present the Classes
Once everybody’s on board for a game of Dungeon World and you’ve sat down to play start by presenting the character sheets. Give a short description of each, making sure to mention what each does and their place in the world. You can also read out the descriptions for each class, those all include something about both what the class does and how that fits into the big picture.
If anybody has questions about the rules, answer them, but for now focus on describing what the classes do in plain terms. If someone asks about the fighter it’s more useful to tell them that the fighter has a signature weapon that’s one of a kind then to go into detail about how the signature weapon move works.