I usually do the expert install and don't install a graphical environment in the first place. But your solution should be fine, too. I think you can show running services with systemctl and then disable unneeded ones. For example systemctl disable gdm but there shouldn't be that much running on a plain Debian anyways.
For powersave I run ` powertop in auto-tune mode as a systemd service. A description is here: https://wiki.archlinux.org/title/Powertop
Unfortunately, the Debian Wiki doesn't seem to have a lot on laptop power saving. The Arch wiki has some more (random) info: https://wiki.archlinux.org/title/Power_management
I'd say do the powertop systemd service on startup, set the multiuser target or disable the login manager and that's it.
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