MvC2 for XBox 360 Questions

Classic Fighting Games Marvel VS Capcom 2
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Please forgive me if this isn’t the correct section for these questions.

I’m looking to purchase an Xbox 360 to play MvC2 live. I’ve never owned an Xbox and want to be certain I can still play live before I purchase anything.

  1. If I purchase an Xbox 360 with MvC2 already installed, will that allow me to play live?

  2. If I can get the disc version of MvC2 for XBox 360, will that allow me to play live?

  3. Is game sharing an option with a friend that already has the game installed?

  4. What is, in your opinion, my best option?

Thanks.