how should I jailbreak my iPod
First you need to check what software version you have on your iPod then download that iOS after you're done with that download a software called redsn0w and use that to jailbreakHope it helped
It depends on what version you have, the best one is probably Redsnow.
Google or Facebook Cydia
Well if you do u loose all your data on your iPod
Simply put, you shouldn't. It is a horrible idea.