I had iTunes way before I had an iPad, can I retrieve that music on my new iPad
I'm not sure I understand the question. If you're asking how to sync your content from your computer, see:
If you don't have the music on a computer and are asking how to download it again, see:
Yes. When you bought the iPad you should have gotten a white cord used for computer. Plug it in a go to your music. Select the ones you want and it will sync. If it doesn't work try it again.
Retrieving data ...