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I am wanting to start a hosting company and am just about ready to open it, however I need to find a way to monitor the various accounts on the server to be able to watch for abuse or malicious script activity.

Is there anyone here that is in the hosting business that can point me in the right direction of what I should look for to accomplish this, please?

This is what you are looking for http://www.clamav.net/lang/en/

I am not so sure if that helps. It seems to me that your provider - the one you are renting the server from should have all the services you will need for what you ask.