Hello, My name is XXXXX XXXXX you for your question.
There is really no proper way to file documents, but it is more what would be better for you.
What you want to do when saving documents is put them into a place or folder that would make it so you can find it easily. I put all my documents into diffrent folders that I have created on the desktop for easy access. I name each folder diffrently, such as "flyers" and "To do list" and so on, this way I can easily remember which folded I would have put a certian document in.