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 PratchettClassically, very few people have considered that cleanliness is next to godliness. A rank loincloth and hair in an advanced state of matted entanglement have generally been the badges of office of prophets whose injunction to disdain earthly things starts with soap.
Terry PratchettLegends don't have to make sense. They just have to be beautiful. Or at least interesting.
Terry PratchettYOU FEAR TO DIE? "It's not that I don't want... I mean, I've always...it's just that life is a habit that's hard to break.
Terry PratchettThat's what's so stupid about the whole magic thing, you know. You spend twenty years learning the spell that makes nude virgins appear in your bedroom, and then you're so poisoned by quicksilver fumes and half-blind from reading old grimoires that you can't remember what happens next.
Terry Pratchett