We help the helpless (fanfic writer)

I'm not familiar with that kind of fic, so I can't really offer an opinion on how much is too much. I'd say you should do as many entries as you need to in order to not lose the story sequence you are trying to get down. As the author, you know best what is needed for a complete story. And, as you say, each one of those entries could eventually be added to, so it seems worth it to go ahead and set them up, even if it seems like too many. Sorry I can't be of more help than that!