SOLDIERX.COM Nobody Can Stop Information Insemination

Hello! Heres my newbie question.
I Followed the instructions on this website to copy an OS image to a usb so i could put it on my newly built PC
( Link Here: http://evan.borgstrom.ca/post/1314205955/osx-bootable-usb-from-iso )
I got to the part where I converted the .iso to an .img.dmg file. The Guide told me to partition the drive and i took it out due to a scheduling conflict. MY questions are Do I need to re partition the USB drive if i re-insert it? How Do I go about copying the .img.dmg to the USB Key from diskutil? and after that how would i go about bringing my usb back to it's regular function?