Make your image file, if necessary, which I'll call "my_image.img" by running this command
mkisofs -r -o my_image.img /home/user/whatever
Burn it to CD by running this command:
cdrecord -v speed=8 dev=0,0,0 -data my_image.img
As in mysterio's example as well, you would want to adjust the speed parameter to fit your hardware. Good luck with it. -- J.W.