systemctl status shows inactive dead

• You have set Type=Forking, but your service doesn’t work. Try
Type=oneshot
• You have a “&” your ExecStart line, which is not necessary.
• The service is disabled, which means it was not enabled to start at boot. You should run systemctl enable hello to set it to start at boot.

You can check man systemd.directives to find an index of all the directives that you can use in your unit files.