Fedora – Systemd Service Script Not Echoing

I've recently setup Fedora 22 onto a machine and it's using the systemd init system.

I've been reading up on it and now I need to create a systemd start up script for postgresql

For testing I created the following shell script, hello_world

#! /bin/sh
#  testing systemctl script

start() {
   echo "Executing Start"
   echo "Testing 01"
   echo "Testing 02"
   echo "Testing 03"
}

stop() {
   echo "Stopping Hello World Script"
}

case "$1" in
   start)
      start
   ;;
   stop)
      stop
   ;;
   restart)
      stop
      sleep 2
      start
   ;; 
   *) exit 1
esac

Which when I run it using the terminal it does what I expect and echos the strings

. hello_world start

This echos "Starting Hello World Script" then I placed it inside /usr/lib/systemd/scripts

Then I tried to create the systemd service script as follows, hello_world.service

[Unit]
Description=Hello World Testing Script

[Service]
Type=oneshot
ExecStart=/usr/lib/systemd/scripts/hello_world start
ExecStop=/usr/lib/systemd/scripts/hello_world stop
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

Which I placed inside /usr/lib/systemd/system and tried to execute with

systemctl start hello_world.service

Which did not give any errors but I did not get the echo string that I expected when i executed the hello_world script alone.

So I can't tell if it is actually working, did I miss something? why is the systemctl command not echoing the string from the script?