Names/Opinions/Ideas for my sci-fi romance thriller?

So I am writing a scifi romance thriller novel and its about a sixteen yr old girl shes very rich and spoiled and kinda obnoxious but not terribly snotty like that (I need a name for her too) and she lives in NYC and she hears on the news that a sixteen yr old boy in LA gets a sword through the throat and even though they live on completely different ends of the US she feels terrible that he died (btw he needs a name also).
the girl gets a message from god that she needs to go on a mission with someone she doesnt even know and the results of the mission will dictate the outcome of our evolution and life.
it turns out the person who must go on the mission with her is the ghost of the dead boy in LA and the only person who can see the danger (its supposed to be like aliens and these scary creatures) is him. so they go on this mission and try to save the world.
i thank u all for ur time and can hopefully help me come up with names for the characters, meer ideas, AND ur opinions on how good it is. thank u!