If your distributions package provides the service file, you can start the ashuffle service with:

$ systemctl --user start ashuffle.service

use systemctl enable to autostart ashuffle on every login:

$ systemctl --user enable ashuffle.service

If your installed package doesn't provide the service file, just copy it into your systemd user directory before using the above commands:

~/.config/systemd/user/ashuffle.service

To start the ashuffle service with parameters, use the systemctl edit command:

systemctl --user edit ashuffle.service

this creates and opens the file ~/.config/systemd/user/ashuffle.service.d/override.conf, insert something like this:

    [Service]
    ExecStart=
    ExecStart=/usr/bin/ashuffle --only 10 --tweak play-on-startup=no

Note how ExecStart must be cleared before being re-assigned.