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 PratchettHowever, you do need rules. Driving on the left (or the right or, in parts of Europe, on the left and the right as the mood takes you) is a rule which works, since following it means you're more likely to reach your intended rather than your final destination.
Terry Pratchett