First steps :
- Check your ipod's firmware.
- Once thats done download a program called [GreenPoison] and custom firmware that matches your ipod.
- Follow the programs (Steps)
- Your ipod should reboot and should be installing the jailbreaked firmware.
Once your ipods done you should get a new app called [Cydia]
I am not responsible for your actions and if your ipod causes problems/Breaks..