The NOOBS install method is by far the simplest method of getting your OS onto your Pi.

Head here to the Raspberry Pi website.

Download the Zip file from the 'NOOBS (offline and network install)' section (it doesn't matter if you choose torrent or direct download it is purely up to you though torrent requires something like uTorrent to download).

You should then end up with a zip file, if at this point you dont have software like WinRAR I recommend you pick it up and install it from here.

Then simply extract the files to your blank SD Card and get ready to move to your Pi.