Okay here is the only jailbreak that will work for the firmware you have
http://evasi0n.com/
and if your device is already jailbroken.... you need to have a certain repo to download iap cracker.
go to cydia
click manage
click sources
at the top it will say add or have a + sign, click that
Now add a repo theres plenty online i suggest cydia.xsellize.com make sure the http:// is in front
now after that is done search iapcracker and install.
and if you havent jailbroken your ipod yet.. use the link that i gave you and the jailbreak tool will do everything on its own.
also have sbsettings installed from cydia.. its a very useful tool.