1. I downloaded the file, unzipped the file twice, which gave me 3,042 files and 13 folders with the total size = 3.07 GB.This means, you've unzipped the disc image (*.iso)?
Which download .zip did you choose from edelivery? Under linux-x64 I peeked "Oracle Linux Release 5 Update 2 for x86_64 (64 Bit) - DVD" file V15099-01.zip downloaded, it has just the one .iso file. You'll need to burn that to DVD, but with burn s/w that handles ISO files.3,042 files and 13 folders with the total size = 3.07 GB