My itunes songs won't appear at all on my mac book
The only way that iTunes automatically syncs music between computers is if you have iTunes Match enabled. This costs $29/year.

If what you want is to have the music you have purchased from the iTunes Store available, you will have to download that music to your new device.

If you're using iTunes 12, click the iTunes Store tab in your Music view. Then click on "Purchased." You should then (presuming you're connected to the Internet) see all of your purchased music. You can download it by clicking "Download All" in the bottom right of that window.