Beyond (Afterlife book 1)

Meghan is 16 when she dies. She wakes up on a flying steamboat on her way to a school run by Angels in a white marble castle. It is a school everybody has to go to before they are let into Heaven. On the boat she meets Mick who has been dead for more than a hundred years but still looks like a teenager. He helps her past the difficult beginning at the new school in a new world.