1) Create a separate LJ account for your stories
2) Make the account friends only, and be sure to only post friends only posts.
3) Join and receive a membership for posting access to Realmsurreal.
4) Post that you've joined and other members will friend you so you can read eachother's fictions
5) When you make a post on your journal, post a link of it to this page. People whom you haven't friended won't be able to access it. Therefore, only friend those you trust because only they will read your stories. :D
After the link, leave a small description or summary about what you have written.
I will give an example on my first post
6) How to make a link. Use a "<" and a ">" instead of a "[" and "]". For example purposes, I have to switch them.
Of course, "my cool new story" can be substituted by whatever other link you would like to change it to.