Please help ipod touch jailbreak?

ok so I have been trying to jailbreak my ipod touch (2G MC model) all day and im am so frustrated. everytime I try to download my ipsw file i get a directory named 'firmware' three .dmg files 018-7058-113 018-7103-078 018-7104-078 a file called build manifest file kernelcache.release.n72 and a file called restore--------------------------please help me