Before you go any further and start downloading packages, you should make sure that you can actually boot Linux/APUS.
Get the required files for booting and follow the boot instructions above.
If all goes well Linux/APUS should boot, displaying a picture of an (alcoholic :) penguin (called Tux) in the upper left corner of the screen. Text should be output, showing the progress of the boot, eventually leaving you with a # prompt and a blinking cursor (unless you boot with debug=<whatever> in which case you will not see the text, only Tux and the prompt).
Your disk partitions should be recognized, notifying you of this fact with some output similar to:
Partition check: hda: hda1 hdb: hdb1 hdb2 hdb3 hdb4 |
This is a good sign as it means the disk driver is probably working. Depending on your hardware configuration you might not see this. Either because there exists no driver for the disk controller, or because the driver has not been included in the prebuilt kernel you booted. In both cases, report your finding to the Linux/APUS kernel mailing list for advice.
The ram disk contains a few tools that allow you to mount disks to see if they work as expected. This ram disk was used in an older installation scheme, but unless you really know what you do, you should use the RedHat installer.
If you got this far, it should be safe for you to start downloading packages for a proper installation of your Linux/APUS system. Good luck!