Hi! I'm Eric, a Mac expert who's been paired with you through JustAnswer.com. I'm reviewing your question now, and will return w/ an answer soon!
Hi Peter! Let's start by talking a little about your old iPhone (the one you are upgrading from). Was it configured to backup to iCloud? If so, that greatly simplifies setup of your iPhone 6s...you need only sign into your Apple account during initial setup, and all of your apps and settings will sync. To check whether iCloud backup is enabled (and perform a final backup, if so), do this:
If your older iPhone was not backing up to iCloud, we can create a backup of your older phone using iTunes on your PC/Mac and then use that backup to "restore" the new phone. Start by backing up your old iPhone:
Note:Write down your password ***** store it somewhere safe, because there's no way to recover your iTunes backups without this password.
If you don't need to save Health and Activity data, you can make a backup that isn't encrypted. Just click Back Up Now.
Barring that, we'll need to create a https://support.apple.com/en-us/HT201269#itunesSync
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