Format it like this, where you provide the full path to the augur_serivce.sh batch file:
[Unit]
Description=Flask Application Augur
After=network.target
[Service]
User=sean
WorkingDirectory=/full/path/to/augur_root
ExecStart=/full/path/to/augur_root/augur_service.sh
[Install]
WantedBy=multi-user.target