1) If you want historical background knowledge you should, but given that you haven't read the previously-published chapters you might not.
2) If you want a narrative then this is more complicated. Fire & Blood doesn't tell a single story, it tells a bunch of different stories where you can't really say where one ends and the other begins, and each shapes the background for the ones that happen concurrently or after it. This is kind of inevitable in a history book, but it still means it's not optimised the way a novel is.
Some of those stories are great! Others are just ok.
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2) If you want a narrative then this is more complicated. Fire & Blood doesn't tell a single story, it tells a bunch of different stories where you can't really say where one ends and the other begins, and each shapes the background for the ones that happen concurrently or after it. This is kind of inevitable in a history book, but it still means it's not optimised the way a novel is.
Some of those stories are great! Others are just ok.