Getting my 6p tomorrow. Suggested first steps?

Been looking through the root guide and of course will be unlocking and rooting. Should I first unlock, flash TWRP, load stock. Set up stock with my accounts and settings. Reboot to TWRP. Make NAND back up. Then root and then flash a rom? I'm still confused about the library IMG file. Will I need to do anything with it assuming the phone I receive was manufactured within the last 2 months?

Any other tips/suggestions would be much appreciated.

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