@Phoenix-Winters-1979 Go for it! You should always go for it with fanfiction, it’s a wonderful way to just spend your time and enjoy yourself. (Side note, in French, Scotland is Écosse, not Ecosie.) If you want advice, think of one particularity for each of your OCs that you’ll then develop. Doesn’t need to be a lot of stuff (actually, too much is bad because then it makes a Gary or a Mary Sue), but something that characterise them (that can change or not, that’s what’s interesting). Why is Valéry studying at Hogwarts and not Beauxbatons would be a start