Looking at the site and not knowing much about it I have some questions.
Di I have to download more than one thing? Do I just download the ISO file? What are the other “packages” and how would I install them?
yes you download the base ISO burn it to a disc as an ISO most disc burners have this option, after you install it you can add or remove pkgs with Synaptic just check mark what you want and it will download and install it.