How do I sync 2 IPads, one old (5 years old but continuously updated) and one new IPad Pro, and my IPhone SE?
How do I sync Apple devices?
iPad Pro, iPadOS 14
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Depends upon what you want to sync. The easiest way is to set them up to use the appropriate iCloud service.
Set up iCloud on your iPhone, iPad, or iPod touch - https://support.apple.com/HT208681
See step 3 on how to select specific items to sync.
Change your iCloud feature settings [iOS and Mac] - https://support.apple.com/HT207689
For music there the Apple Music subscription service.
Join Apple Music on your iPhone, iPad, iPod touch, Mac, or PC [or Android] - https://support.apple.com/ht204930