1. I think will is a writer and he loves writing because he has an amazing imagination.
2. I think he is extremely small and the book he is writing is huge.
3. I think 'he had an important job to do' means someone is telling him he has to write something and I think what he is writing is very important.
4. I think he is writing a spell book.
5. I think there is ink and food in the box.
6. I think the room would be bare and empty.