Fedora xen - Aug 2006 - How to boot in a non-existing guest via cdrom

Hello,

I would like to try to install FreeBSD on to a guest on FC5-Dom0.
Therefore, i would need some help.

1) I think i need to create an image using dd?
2) How can i then tell this image (which still is quite empty) to boot
from cd-rom?

Anybody tried this already? How do i have to do this the easiest way?

Thanks,
Roger