My advice is this. For Christ's sake, don't write a book that is suitable for a kid of 12 years old, because the kids who read who are 12 years old are reading books for adults. I read all of the James Bond books when I was about 11, which was approximately the right time to read James Bond books.
Terry PratchettTragic heroes always moan when the gods take an interest in them, but it's the people the gods ignore who get the really tough deals
Terry PratchettI don't want unnecessary violence, sergeant," said Blouse. "Right you are, sir!" said the sergeant. "Carborundum! First man comes through that door runnin', I want him nailed to the wall!" He caught the lieutenant's eye, and added: "But not too hard!
Terry Pratchett