How to install an init.d script?

I am trying to install an init.d script, to run celery for scheduling tasks.Here is the steps I followed:

• copied the file celeryd and pasted it in folder /etc/init.d/
• created a configuration file celeryd in folder /etc/default/

now when I tried to start it by sudo /etc/init.d/celeryd start, it throws error sudo: /etc/init.d/celeryd: command not found

I googled about how to install init.d, I got this SO-question.

it says to issue a uname -a and when I does I get this:

Linux capsonesystem8-desktop 3.2.0-43-generic-pae #68-Ubuntu SMP Wed May 15 03:55:10 UTC     2013 i686 i686 i386 GNU/Linux

and also it says use utils like insserv to enable init.d scriptso tried:

insserv /etc/init.d/celeryd but it throws error insserv: command not found

so I tried to install insservsudo apt-get install insserv. but it say aleady installed:

insserv is already the newest version.0 upgraded, 0 newly installed, 0 to remove and 222 not upgraded.

So how to install init.d script?? Any help will be appreciated.

update1:

when I tried:

$ sh -x /etc/init.d/celeryd start

it reveal some errors. may be that is why the service won’t start.

update2:

I cleared all the errors when I run $ sh -x /etc/init.d/celeryd start but still sudo /etc/init.d/celeryd start throws command not found error