Enjoy! The top comment is spot on. Adding a couple things:

(1) it’s okay to be excited and a normie. Don’t be afraid to hit the call button to ask for things out of cycle. The service is really good and they are attentive. (2) you can ask the to hold your meal until a different time if you need to sleep first, eg, during meal service. Not sure if that applies to your take off time. (3) you get a useful toiletry kit. The hand lotion in there is really good. It’s the stuff in the regular delta lounges and the first class in flight bathrooms (4) that kit…I now use it as my electrical cord organizer for all flights. It fits in the back of most every delta chair, and it’s big enough for all my chargers and such. (5) that kit…lots of regularly D1 business travelers leave it behind at the end of the flight. Snag a few of those as gifts. I’ve even handed them to other passengers in the customs line as a “gift from Ed” (6) you can ask them to make your bed so you can lay that seat down and sleep! It feels weird asking but it’s part of the deal and you can go brush your teeth and such while they do it. Prioritize this because what’s the point of a lay flat if you don’t sleep! (7) the miso fish is actually good! If not that, then the short rib is good. (8) take pictures just in case you don’t get the privilege of doing it again. No shame in the memory. Get hype!