Hello @davidbourguignon, Welcome to the /e/ users forum.
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For users used to use Windows, i think the easiest user interface to use is KDE…
Lol …for the abusive use of use… (although i personally like MATE)
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for your android install party, you may find usefull :
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[HOWTO] an Unified Install Guide Project for /e/
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[HOWTO] a Clear Guide to install "IMG-e-builds" when /e/ web installer fails
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[HOWTO] Upgrade my /e/OS to major Android version without loosing /data