In my experience of the member section during my one-month free membership, it contains pretty much comics/picture books of an erotic form, as well as plenty of high-res drawings. I didn't see any full books though, ie: published commercial works.
You can change your story once it is uploaded: just put a note to Jinn in the comments section of your submission, and he will update a part of the story you have already submitted (spelling corrections, etc) And you can add chapters, obviously. Just send the next section, along with the name and your details.
Look forward to reading your stories
Not sure what happened to my latest submission though, I posted it a day before the last update and it's not there. Perhaps it got lost during the site changes? *submits again*
LD