Exorcising Stories

13 year old Stephan wakes up in the middle of nowhere and doesn't seem to be remembering what happened. He asks around for help, but everyone ignores him. He wonders around confused, until he meets another boy, a little exorcist. They make a deal and the boy promises him to find out about Stephans past before exorcising him and sending him to the afterlife. This is my first time writing a story so tips, tricks and criticism are allowed and can be helpfull for me improving my writing skills :>

Callum has is become possessed. Can the master exercisor Claudiu Smith sucessfully purge the demon from poor Callum and save the day?