How to import songs from my iPhone into my new iTunes?

I haven't been using itunes and now i want to. Since the iphone 5 is coming out i need something to put ny music to or all my music will be gone. I used frostwire to get my music. How do i import my music from my iphone to my iTunes library?

Hook up you iPod to your computer and open up iTunes (if you don't have it go to apple.com to get it free) then it should show up in you iTunes and press sync. It should load all of your songs onto your iTunes. If you have an option o back up your iPod to iTunes do it.