I wanna FaceTime but I dot know howto face time other iPods only my moms iPhone cause I know her number! How do i get/find my number?

Face time does not use a number on the touch as it doesn't have one, it uses an email address. First off you need to have the person you are face timing in your contacts along with their email address. You also need to turn on face time on your device: Settings>Facetime>On

Once that is done, connect your touch to a wifi network, go to your contacts and you should have the 'facetime' button appear. Tap it and off you go!

Happy Facetiming.

Good question.
There isn't a set "FaceTime number" but you have to use your Apple ID.
People can call you from your email address and vice versa.
I think you can use their phone number instead. Though since yours is an iPod it has no phone number. So if you can facetime your mother then you have an Apple ID. Just give others the email address that you use to sign into your Apple account. Simple as that.