I’m about to fly with United internationally... what do I expect? I’m used to flying with southwest.?

United isn’t as clear about things like southwest. We are flying from Nashville to Chicago and we having at 4 hour layover. Then we are fly for 13 hours to Japan. How much is 2 checked bags? SW is free. Is this assigned seating or can webpick where we wanted sit? I’m going with 5 people and I want to be with them... show more United isn’t as clear about things like southwest. We are flying from Nashville to Chicago and we having at 4 hour layover. Then we are fly for 13 hours to Japan.

How much is 2 checked bags? SW is free.
Is this assigned seating or can webpick where we wanted sit? I’m going with 5 people and I want to be with them but worried that’s not happening.
Do you we have free WiFi or we have to pay?
Is there usb outlets on the plane? I’m getting a battery bank just in case.
Do they provide complementary snacks and drinks and we have to pay for them.

Any other advice or tips for this airline and long haul flights?
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