1) I love books, and organizing is one of my hobbies.
2) With magic, I can transfigure objects into other objects and make them into shelves. There are also duplication charm I can use to produce multiple if needed.
3) I only have the one book I loaned you, but would be willing to explore other worlds to find more. I don't particularly like going through the doors, but would do so for something like this.