Ok , Im new so please be easy

Im trying to do a few things with this install .
Try to open my mind to a os other than winblows. =)

fun FAH as i hear it is faster in Linux and run a cs server.

So why does apt-get not work ?
and why after I run hldsupdatetool.bin (csserver) it is trying to uncompress a file called steam . I was able to do this very easy with Ubuntu. But this os is saying this "sh: uncompress: command not found"

Im trying to run updates but I dont really know where to start is there a guide on what to install I didnt see any stickeys .
When I try and install things it says Sorry, the following packages can't be selected: