So basically you need to either check to make sure that netctl is installed, or install it.
It sounds like you are a beginner, so it may be worth installing wicd. Since you are also apparently still at the point of setup where you don't yet have a graphical interface, you should know that wicd in our repos has been split into wicd and wicd-gtk. The latter is the graphical interface/tray icon. So all you need is the plain old wicd to get things going, as it includes wicd-curses, which is a ncurses based interface.
Wicd is what I used for quite some time, and it never did me wrong. I just eventually learned that there were other alternatives out there, and I now use basically all of them depending on my mood.
]]>This thread is also relevant.
]]>