properties-service.xml
Key-value pairs placed in this xml will be sent as system properties for use by JBoss applications

monitoring-service.xml
If you want to write any monitors.


remoting-service.xml
Used by the rempting framework.

user-service.xml
Always empty. User defined MBeans can go here.

client-deployer-service.xml
It is an MBean that is used to control deployment of client apps in Jboss.



Since you are a newbie, you can leave the files just the way they are.

Have a look at the following doc. You will need to register to have free access.

http://docs.jboss.org/admin-devel/Chap1.html#0_pgfId-915907