How do I get the old Apple ID off of my iPhone and the new one installed?

I got a MacBook Pro and decided to create a new Apple ID different from the one I previously had. How do I get the old Apple ID off my iPhone and the new one installed?

When I tried this, my music stayed the same whereas my new iTunes has only about half the music it used to.  How can I get all the music to clear out so that it can sync my new music to it.  Simply connecting it to the MacBook Pro and pressing Sync has not worked.

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