Go to
www.nagios.org, read the complete documentation, downlad packages for your distro, install the software, configure as explained in the documentation, come back if there are any real problem with logfile entries and your question.
This is a forum of Voluntary useres. If you are looking for commercial support you are able to find a consultant in your country which will help you.
Definitely you should read
how to as a question the smart way.