This document will help you with setting up ASM CloudMon agent to run as a Windows service. 

Windows services don't allow batch files to run as a service and ASM CloudMon agent doesn't have an executable to start the agent. 

ASM Agent for APM

To get the ASM CloudMon agent to run as a Windows service you will need to download a third party product and review information about setting up using a batch fill in a Windows service.

Here is a couple of links to help.
https://stackoverflow.com/questions/415409/run-batch-file-as-a-windows-service

This will then lead you to http://nssm.cc/usage  This application will allow you to start the ASM CloudMon agent batch file and it run as a service.