The tricky bit is knowing which story you want copied first. But you certainly don't want to involve system Events, or even copy and paste. This should get you started:
tell application "Adobe InDesign CS4"
set theSel to selection
set thePage to parent of item 1 of selection
set emptyFrame to text frame 1 of thePage whose contents = ""
duplicate parent story of item 1 of theSel to after insertion point 1 of emptyFrame
duplicate parent story of item 2 of theSel to after insertion point 1 of emptyFrame
Thank you Shane for your response. But I am getting an error message on
set emptyFrame to text frame 1 of thePage whose contents is ""
The error message is: Can't get text frame 1 of story id 221 of document "Unititled-1" whose contents = "".
That means there is no empty frame on the page.