Easy: start with the ES-8 and the Metropolis. That way, you can lock the Metropolis up to the DAW's sync clock, and the Metropolis is perfectly usable with the SE-02, which will allow you to start learning all of the tricks that sequencer has up its sleeve. I'd then fill out the bottom row as shown (and move the ES-8 into its place up top), allowing you to get used to the trigger sequencer, drum modules, and the performance mixer next. After that, any order that feels right should be just fine.
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Got it.