you can do either sar or ear, both can deploy services (the har file is a service).
if you use a sar file, just put the all the files at the root of the sar they will be deployed.
if you use an ear file, you need to declare :
war in META-INF/application.xml
jar referenced by other files through META-INF/MANIFEST.MF using the classpath manifest entry
har in META-INF/jboss-app.xml
a link http://wiki.jboss.org/wiki/Wiki.jsp?page=EARSAR explaining jboss-app.xml
for the war and the jar it is pretty much standard, anyway all of this can be found in the online documentation.
you can take the forums as an example too