Hey guys I need some help with a story idea.

I really want to write a what if serie to the Harry Potter fandom but the thing is I don't know if I should put it in only one book, make a one shot book with more chapters. Make loose stories or something different. It isn't done yet but you know just already want to know

What I was thinking tho is that I would like to take requests and stuff. But I don't know how you guys would think about it

And I still need help with the idea of Harry, Remus and Sirius going back in time. like they go back in time but they still have their memories and Harry is still pretty powerfull because he has had a lot of time to use his magic. But I don't know which year they should go back to. I was thinking of fifth year and that they free Sirius in secret. And when Harry ends up in the house from Sirius that when he hugs Sirius that he begins to cry or something. But I don't know for sure guys.

Please help!