Congratulations on getting a new iPod touch! I'm sure that you're excited to start using it the same way you used your previous iPod, and from your post I see that you need some help getting your music onto it. I'd be happy to help!
There are a few ways you can go about getting your music back onto your iPod. There is, of course, redownloading purchased content, which you can get more information on doing here: Redownload apps, music, movies, TV shows, and books from the iTunes Store, iBooks Store, and App Store - Apple Support .
If you're looking for alternate ways to get your music transferred, you can use the following articles to get information on your options:
Transfer content from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support