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My pleasure !
When you first set up your new iPad you will be given the option to "Set up as New" or "Set up from Backup". There will be a list of backups, so...
If you back up either of the old iPads to iCloud, you can set up a new iPad using that backup. The data will remain on the old iPad.
The iPad OS isn’t to be released until 24th September. I will probably wait a day or two and then download it.
Mothers often warn their children of dire consequences if they do such and such!:)
Seriously, though, provided you keep the screen clean and do...