This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
jboss-service is located in the server/yourConfig/conf directory.
You would place the jar file in the deploy directory of server/yourConfig directory. "yourConfig" is whatever you are using. It might be minimal, default, all, or a copy of one of those that you customized for your environment (which is highly recommended to do).