Q: how can i find my device

Unless you had Find My iPod enabled on it then there isn't any way to locate it. If you did have it enabled then you could try locating it either via http://icloud.com on a computer or Find My iPhone on another device - but that will only work if it's connected to a network and the device hasn't already been wiped and/or Find My iPod disabled on it.

If you think that it was stolen then you should report it to the police. You should also change your iTunes account password, your email account passwords, and any passwords that you'd stored on websites/emails/notes etc.