Help? need help! (writing)?

Need help writing a scene. Basically, a girl (Selena) arrives at a witches school and she goes to meet the Witch Superior. She’s taken to the hall by a girl called Cleo. Im stuck from there. I need something like Harry Potter but not like it if you get what I mean. Sorted into a house or something. I have after the sorting and before the sorting, but I don’t know how to word it. Can anybody help?