Welcome to LQ, Philip! I have moved your question to a separate thread. It makes it easier for other members to find it.
Now, back to your question. It's quite important to know which RedHat version you have. Try to use the newest one - more drivers etc. Before installation you need to know where you'd like to install the system - if you'd like to dual-boot or use the whole disk(s) for Linux. The whole process is rather easy, so just read the messages the installer shows and it should be fine. If you have more specific questions, just post them!