I have everything I need a new (refurbished) 2011 iMac, 128GB Crucial M4 SSD, 2TB Seagate Barracuda drive. My only question is How do I get the OS on to the new drives once they're in the iMac?
Open Disc utility, you should see your drives there. Go to erase and select Mac OS X Extended (I think it is set by default), hit erase. Takes a minute or two.
Insert your thumb drive, restart your mac while holding "option", then select the thumb drive and go from there.