I have a few suggestions that will help you to better organize your stories. Feel free to use it or ignore it, it's totally up to you.
1) Create "Reading Lists" for your series. Why? It makes it where people can easily tell what books go together and which books don't. It's best to add the stories to the "Reading List" in order as I'm not sure if you can rearrange the order.
2) If your book belongs to a series add some sort of acknowledgment of this fact either in the title or the description. EX: "The Knight in Red (Sequel to The Kingdom of Chaos) or "The Knight in Red (Book Two in the Kingdom of Laria series)
3) Add your writing schedule (if you have one) and your stories in your profile description so people have another way of knowing which books belong in a series and which don't.
As mentioned above this is just suggestions, you don't have to do anything with it.