Go read the Oracle 9iAS documentation. There is plenty of it on-line.
If you have access to the App Server, the following (for example) deploys the soap.ear file with dcmctl:
dcmctl deployApplication -f $ORACLE_HOME/soap/lib/soap.ear -a
soap -co home -v
If you're using JDeveloper, you can deploy to your App Server with a right-click on your deployment file -- after you set up your app-server connection.
Oracle 9iAS IS a J2EE server, among other things. And OC4J should come installed by default.
[ April 08, 2004: Message edited by: R Hayes ]