Nagios configuration

Hi,

I want to configure nagios core with my own scripts.Default configuration has been done like ping,http,Root partition,..so on...
But according to my requirement i have a script called cpumon.sh which will monitor the current cpu usage.
I gone through below link but could not find out respective folders(/usr/lib/nagios/plugins, /etc/nagios/private/resource.cfg) which they are mentioned in the provided site.
Could you please suggest me that how can i do it.

Link: http://www.openlogic.com/wazi/bid/256126/How-to-extend-Nagios-for-custom-monitoring

Regards,
Mastan

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