I'm guessing the following, if I understand you correctly:
You don't 'choose' where your posts go. Posts are ordered from top to bottom, from the oldest to the newest. There are 10 posts on each page. You cannot put your posts above someone else's unless you post your message before them, forum time.
In essence, if you want to create a story where you have 50 posts of story in the beginning without interruptions, you will have to make 50 posts. You can ask people to stop posting while you make reserves, but some people blatantly ignore this (cough, guy who did this in Brotherly Love, cough). Posting in rapid succession is the only way to guarentee your posts are linked together.
If that even is your question?
16-Nov-2011 11:01:47