@Manish

Try this

1./ Try to create file under /etc/init.d

• touch office_service
• edit this file - vim office_service
• paste the following in it and save it-

/usr/bin/soffice --nologo --nofirststartwizard --headless --norestore --invisible "--accept=socket,host=localhost,port=8100,tcpNoDelay=1;urp;" &

• change the access rights

sudo chmod +x /etc/init.d/office_service

• set it to defaults to start automatically when the system starts

sudo update-rc.d office_service defaults

• start the service for first time  - /etc/init.d/office_service start
• Check the service by following command

telnet localhost 8100

  hope this helps !!