Jumping right into the depths of 1000 plateaus right off the bat is a lot to take in, especially the war machine chapter. It's a very dense text and assumes a familiarity with a wide swath of philosophy, and tbh is meant to be a bit esoteric. Don't feel discouraged though!
Here are some better starting points to their work together, if you want to read primary sources:
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The first two interviews in Chaosophy, pdf readily available online, are more digestible.
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The Foucault intro and then first chapter of Anti Oedipus
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The Massumi forward, and the intro in 1000 plateaus
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edit: also Deleuze's stand alone essay, Postcript on Societies of Control. It's very clear and interesting.
There is a litany of secondary lit on them, but I find them really fun writers to read first hand, even if some of it is absolutely useless imo. I've heard the Eugene Holland reader for 1000 plateaus is good.
These videos are helpful and are pretty chill (edit: he tends to read around their politics tho). Just a dude explaining stuff while he shows you videos of his walks lol: https://www.youtube.com/watch?v=GS35vUMhww4