Non-revving to China on DL or UA -- what to expect

Hello
Just curious on what I can expect on ZED flight from West Coast to PEK on UA or DL.
I've only non-revved overseas twice and both times in Biz Class, so I'm definitely out of the loop.
Is there inflight entertainment? Is there a charge for headphones? Or should I plan on bringing 24-hours of reading material. Are there plug-ins for laptops in coach?
What about meals -- should I bring a sandwich aboard a la WN, or is there inflight food service? Is there a charge for that? Is there a charge for checked bags?
Hate to sound like a rube, but I'm just accustomed to the somewhat Spartan amenities of domestic travel and wonder what to expect on international flights.
Thanks much

check seatguru.com for details/configs etc for entertainment
DL coach offers meal (usually 2 options) , snacks, comp std H2O, bevs and wine, cocktails are extra--CC only--no cash