Hello and Welcome to LinuxQuestions,
First of all, RedHat is not free, you may download for free and use it for free in an evaluation license type. The best place to get RedHat is from the RedHat website
. That being said, is there any reason why you'd want to start with a version that old of RedHat? The latest stable version is 6. If you want the power of RedHat but don't want to pay for it, then have a look at Fedora
. Have fun with Linux.