Hi, and welcome to Linuxquestions
Nobody is laughing at you. It is great that you want to try Linux, this place wont scare you away. Thats for sure.
If you are running Redhat as you write, then you downloaded the wrong file. Files with .deb extension is for the Debian distribution.
Use this link:
Grab the file corresponding to your Redhat version. Follow the Redhat three step how to