answer to question #1
answer to question #2, you can get it here
And its not an IT
, there are many different flavors
of linux which are called distrobutions.
and how to run it is by downloading an ISO file, burn it to a cd, put it in your cd rom, reboot your computer, go through the setup which will run if your computer is set to boot from your cdrom, and then before you know it you'll be on the desktop.
With your very "simple" questions, you will get very simple answers. It obviously sounds like this is going to be your first time
, and your just going to have to install it and start playing with it, and of course read read read, learn learn learn.. Easy as that.