Here the fast downloading and installation guide for Oracle Linux.
Where to download:
1 . Choose Product to Download
2. Choose Platform -> Press "Go" Button
3. Choose the release (for example Oracle Linux 5.7)
4. Download full release (not source)
How to install :
Please see the Step by Step guide for Oracle Linux Installation by Gokhan Atil.
This is the best that I found and I always use it (Thanks you Gokhan Atil)
Oracle E-Business Suite Installation and Upgrade Notes Release 12 (12.1.1) for Linux x86 [ID 761564.1]
Oracle E-Business Suite Installation and Upgrade Notes Release 12 (12.1.1) for Linux x86-64 [ID 761566.1]
Good Luck ...