So, if I start a service in systemd, such as
systemctl start ipp-usb.service
,will it then continue to start automatically in each new session / reboot?
No, that will start it only for the already running instance of the operating system.
In order to both start a service and have it automatically started at every boot, you must use… 
sudo systemctl enable --now name-of-service
See…
man systemctl
P.S.: Your question has nothing to do with KDE Plasma, so I’ve moved your thread to the generic Support category.
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