How do you do an offline install in RHEL7.

I am very new to Linux. Working with a machine that is unable to connect to the internet, due to the environment that it is in. Please could someone give me a way of installing. I have tried packaged installs (RPM) that didn't work, i am happy with terminal, however i would need guidance. Links to the software would be great too as i seem to not find the right ones. The machine its running on is a normal X86_64 machine.