[Koha] install and configure it for the first time

Hello, I am quite new to Koha and am trying to install and configure it for the first time. I have loaded Debian, MySql, Apache and Perl. However, now I am trying to figure out how to load Koha itself. I download and burned to CD koha-2.2.5.tar.gz Now I am trying to figure out am I heading in the right direction? Un pack the tar file and install it? Thanks, New2Koha