Mostly regarding your #7
I am just starting to FM but it's all online. I'm using Roll20 only (Discord for voice). I found a cool image of all the cards of a Fate Deck online, cut each card into its own file, and created the deck in Roll20 so it's all there.
For maps, I have been using a mixture of Scene Pictures and battle maps. Scene Pictures are to set a mood and aid theatre of the mind. Battle Maps are there for when positioning is important, especially with multiple enemies. I have made the grid 1 square = 1 yard since all the weapon ranges are measured in yards. Movement is also measured in yards, based on a character's speed. When it's safe to get back to in person games I plan to use 1" = 1 yard.
I have found that, since I control the cards and they take up a space on the screen for everyone, I am leaning more and more towards scene pictures and theatre of the mind as well as trying to create some sort of "dead space" on the battle maps.