Q: ive lost my ipod and i havent downloaded the "find my ipod" what should i do?

report it to the police..nothing else can be done....other than look for it

You do not need to download anything. All you needed to do is go to Settings>iCloud and turned on the FindMyiPod feature. If on and wifi is on and connected go to iCloud, sign in and click on FindMyiPhone.

See:

iCloud: Troubleshooting Find My iPhone, iPad, iPod touch, or Mac

Restoring the iPod will permently delete the Find feature.

Otherwise report to police, look for it the old fashioned way and change the passswords for all accounts used on the iPod.

Apple will not help

Reporting a lost or stolen Apple product