There are millions of instructions how to burn a bootable iso file on the web.
OmniBoot can be written as bootable isos. Please read Create CD DVD for details.
You can use any burning software and your medium must fit in size (no DVD-image on a CD).
You must burn this iso-file directly as iso.
Your burning software has this extra option, which is different from an ordinary data-medium.
You can use all kinds of rewritable CDs or DVDs too.