Sync Phone's iTunes to New PC

I haven't synced my phone to my computer for over 2 years now that I set up the auto backup to icloud. But I want to update the music on my phone so I want to sync to the itunes on my new PC and can't. I only want to sync the music which is a playlist on my PC's itunes. When I first connected the phone to the new computer, a message appeared on my phone that asked something about apps and photos which I didn't want to alter so I clicked "no." That was probably a mistake but I panicked! I don't want to change anything in my phone except the music. (I still have the old PC that the phone might recognize but I want my NEW PC to be the sync computer.) What steps do I need to take to enable a sync with my new PC? (Before I perform the sync I will make sure that I set it to only sync music and nothing else to ensure I don't lose any other data.) Thanks!

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