Which URL, port and weblogic server side settings do I need to use?
It depends if you want to connect to a WebLogic MBean server (Domain, Runtime, Edit) or platform (JDK) MBean server (See MBean Servers).
Connecting with JConsole to a WebLogic MBean server is usually a real pain:
Connecting to platform MBean server is like any other JVM (See How to activate JMX on my JVM for access with jconsole), but you would not see any WebLogic MBeans unless you configure WebLogic to use it (See Registering MBeans in the JVM Platform MBean Server).