You only need to sign up and login to one instance. You can then subscribe to the various communities regardless of what instance they are hosted on. All those communities will then show up under your subscribed tab. If you look at my name, I am posting to you from an instance called Sopuli while you are currently on lemmy.world.

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I’m very similiar. #2, #3, and #5 certainly. #1 I have an aversion to many liquid foods, so it’s not really an issue for me. #4 I have the palate of a 5 year old, so there isn’t much to ruin.