I had the idea of a boy who was a wizard and didn't yet know what he was. I never sat down and wondered, "What shall I write about next?". It just came, fully formed.
J. K. RowlingDuring the first five years that I was writing the series, I made plans and wrote small pieces of all the books. I concentrate on one book at a time, though occasionally I will get an idea for a future book and scribble it down for future reference.
J. K. RowlingThe exceptions were two men a little ahead of them, standing just outside the Three Broomsticks. One was very tall and thin; squinting through his rain-washed glasses Harry recognized the barman who worked in the other Hogsmeade pub, the Hogโs Head. As Harry, Ron, and Hermione drew closer, the barman drew his cloak more tightly around his neck and walked away, leaving the shorter man to fumble with something in his arms. They were barely feet from him when Harry realized who the man was. โMundungus!
J. K. RowlingI don't feel quite normal if I haven't written for a while. I doubt I will ever again write anything as popular as the "Harry" books, but I can live with that thought quite easily. By the time I stop writing about Harry, I will have lived with him for 13 years, and I know it's going to feel like a bereavement. So I'll probably take some time off to grieve, and then on with the next book!
J. K. RowlingThey had reached Lockhart's classroom...'You could've fried an egg on your face" said Ron. 'You'd better hope Creevey doesn't meet Ginny, or they'll be starting a Harry Potter fan club.' 'Shut up,' snapped Harry. The last thing he needed was for Lockhart to hear the phrase 'Harry Potter fan club.
J. K. Rowling