Be sure to get the JDBC driver for MySQL. Place this jar file in the /lib directory. When you unzip a standard JBoss distribution, you'll find a docs/examples/jca directory with many examples for configuring databases. There is also a MySQL version (I attached it for your convenience). Modify this file so that it reflects your evironment and put it in the /deploy directory.
Contact me if you encounter problems.
How can I verify that this is working properly prior to deploying something and verifying that way(that is my next step). Thanks