You should start with the docs first http://www.jboss.org/jbosstm/docs/index.html
And there is also a short wiki article on using JTS https://www.jboss.org/community/docs/DOC-13179 which was written for a later version than the one you are using but it may still be of use.
And there is lots of stuff on the web which google should pickup.
Please note that this is the design forum. It is intended for use by those who are implementing JBoss Transactions or related JBoss projects and wish to discuss design decisions concerning the implementation of JBoss Transactions. It is not appropriate for questions regarding how to use JBoss Transactions.
Your question would be appropriate appropriate for the user forum:
Please direct any future queries via that URL