I M VERY FRESH TO LINUX AND backtrack........

when i run airmon-ng in konsole then it shows nothing below wireless,chipset

then i myself comes to an decision of installing driver for my atheros ar9285 adapter
but does not find it..........
how to install it and download it.....
please explain in detail i know nothing about linux.

and also if there is another reason for not proper working of airmon-ng please do tell.please .............i m a new bie help me