There is also a root thread for your device here ( http://xdaforums.com/showthread.php?t=2732311 ) though it is not related to root since there is no specific forum for your device you could ask if any users of your phone know what to do.
I'd also like to remind you that odin is not for LG devices, it is for Samsung so I wouldn't try any odin related methods or it may make your situation worse.