Haha, saw it this morning with my wife (not a comic book fan) and that was her only comment: "why didn't Iron Man or the wizard guy just laser his hand off instead of trying to take his glove off?"
#2 Otherwise... At a minimum, I'd watch the Avengers, Avengers Age of Ultron, Thor: Ragnarok, Guardians of the Galaxy, Guardians of the Galaxy 2, Captain America Civil War, Dr. Strange.... I'd consider the other two Captain America's and at least the first Iron Man... and since it just came out Digitally, Black Panther.