Welcome to the Apple Support Communities Dsughtersipod,
It sounds like you're looking for help with getting your daughters' iPods setup, we'll be happy to assist!
The best way to proceed, is for each person to have their own Apple ID. If you want your daughters to have access to only their own messages, but also content you've purchased, be able to make purchases you Approve, or if you want to manage the content they have access to, that can be accomplished through Family Sharing.
The following page offers additional information on the subject that we expect you'll find helpful. Use your own Apple ID for Family Sharing
You can find guidance to help you get started with Family Sharing, here: Set up Family Sharing
Once you have Family Sharing setup with your Apple ID as the family organizer, check out the following page for help settings up your daughters' iPods: Help your child set up an iPhone, iPad, or iPod touch
Take care!