To make sure everything goes the right way, ensure to have fully understood this document.
First of all, power up your node and insert the CD. You must boot from the optical drive, but since you are going to install C.H.A.O.S. and not Ubuntu, I suppose there's no need to tell you how to do that.
When the CD Boot Menu comes up, choose the option that suits your node's architecture.
Then, as the Live system has completed the boot procedure, you will be presented with this screen:

Enter the command:
./CHAOSinstaller
to get the installer going.

The semi-automated C.H.A.O.S. installer will start, presenting you this screen:

Answer "M" if you are installing the Master node or "N" if a Slave.
This guide refers to Master installation, but the Slave setup should be the same.
The installation will proceed asking if you want to partition:

Then the real installation will begin:

After all the packages have been installed, the network configuration will take place.
This step may look kinda tricky:

The last operations will be done and the bootloader will now be installed:

You're almost finished; reboot and, once in control of the prompt, start the post-install configuration script.
sudo /root/postinstall
sudo /root/postinstall_node
You will be asked if you want to set up USB Key or Fingerprint authentication.
Once that script is done, refer to the [SSH] page to copy the SSH keys all over your machines.