If your old phone was an Android device and you saved your contacts, photos, music and apps to your Google account, then everything is available from your new phone when you sign in to that Google account.
If your contacts are saved to iCloud:
Export your contacts from iCloud:
Import your contacts to your Google account:
If your contacts are stored directly on your iPhone:
If your music is on your old phone, upload your music to your Google account.
If your music is on your computer, transfer it to your phone using a USB cable.