@bkone - So I have done imaged Linux servers using BigFix in the past. I have used this for bare metal deployment and have used it to migrate several ubuntu boxes over to rhel and have also migrated a few boxes from rhel to oel.
I can tell you that the only documentation I have used is the OSD users guide pdf. Chapter 5 was really all that was linux specific, everything else is either general between operating systems or windows specific.
As it relates to getting a video or documentation, I would check out the guide above and then I would follow the OSD Health Check Dashboard, which allows you to get ready for imaging pretty quick. Just read through any warning/error in the dashboard and address anything related to infrastructure, setup.
I would definitely recommend installing the baremetal server as I believe that makes the creation of Linux image pretty easy and you would need this for USB Booting, or CD/DVD boot disk.
Feel free to reach out with any questions.