This is an awesome start! I don't think I've of read or seen a story where Percy is sent back in time and will goto Hogwarts and also meets Hecate! I liked the beginning of the part in the past. It didn't feel rushed like you want to get there as soon as possible. Now that I think about it, this entire story wasn't really rushed at all. I liked that you started with a little scene from the book and gave it your own little twist and went off from there. Keep writing!

P.S. Do you have any advice for beginning writers? Or links that can help new writers out!

well, this looks like it will be an interesting tale for Percy. The next ch. should be fun to read

nice idea, you should write a few more chapter to let the readers get a better idea on this story. although it is great chapter oh and update the percy Jackson and the game story please