Congrats.
First thing is check for proper staking of the bolt carrier key screws and buffer tube castle nut, see tacked threads for more info, also use a bolt extractor upgrade kit with chrome silicon spring material, proper Mil-spec black extractor insert buffer and Crane O-ring (from G&R Tactical).
I would highly recommend the Blue Force Gear Vickers VCAS two point sling, in my opinion it's the best in the market today.
For spare parts at a minimum a firing pin retaining pin, this is the only part that I had broken in the many years as an AR user.
Maybe a spare bolt assembly and firing pin, even better would be a complete BCG, I would recommend getting a properly staked carrier key screws from Grant of G&R Tactical.
A field replacement parts kit which have the frequently replaced parts and springs would be a minimum but if you want to have more parts get a whole lower parts kit, but I'm warning you that this might turn out to be your next complete carbine.
Enjoy your new AR.

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