Tomorrow, When The War Began - Before we read

In English, The teacher told us to Answer the Questions and what we think about  what it's going to be like

One advertisement for ‘Tomorrow, When The War Began’ states:
‘Hell isn’t only a place for the damned, sometimes it’s a place where the saved take refuge… Seven teenagers take a trip to Hell. And seven come back. To Hell’

Question
1. What do you think this statement means?
2. What could ‘Hell’ mean in this context?
3. Why do you think the story is entitled ‘Tomorrow, When the War Began’?
4. What does that make you think the book will be about?
5. What do you think the characters will be like?

Answers
1. I think it's about Seven teenagers  visit a place which is I don't know
2. I think hell means the place where the war takes place.
3. I think it means something interesting happened before the war began.
4. I think it's going to be interesting.
5. I think they are brave at the same time scared.