A:AnswerTo answer the first question, 240Hz is better than 120HZ. The second question I would assume go in tandem with 60Hz, and the motion is more of a option for action scenes.
A:AnswerYes, it has a digital audio (optical) port and analog out ports. Just make sure this is how the sound bar hooks up. Most soundbars use digital audio (optical).
A:AnswerI used the screws provided with the television. They were, I believe, Philips head screws. I would add that I am using the stand provided and it is (much to my surprise) very stable.