Guys,
You don't need to jump to writing a startup script until you install the binary files, the config files; and manually start of the process to make sure it works.
Just install (copy) the zabbix binaries to any bin folder you want (based on other installations if that makes you happy), and install (copy) the config files to somewhere in /etc, like
/etc/zabbix
(maybe the files are already copied to their final resting places?)
Then, try to start the zabbix agent.
It will give you an error.
The error will be something like "cannot find config file in
/etc/zabbix.config.blah.blah and then move to the config file to where the zabbix agent wants it to be.
If you did something like this, you would already have it up and running. It's not rocket science
You (sph919) are looking for a clear instruction on something you can easily do in less than a 1/2 hour with a bit of trial and error.