How to send FIX message with QuickFIX/J

I need a simple example of how to initialize a session and send one FIX message. I have this initial code:

SessionSettings settings = new SessionSettings( new FileInputStream("fix.cfg"));

Application application = new Application(settings);
MessageStoreFactory messageStoreFactory = new FileStoreFactory(settings);
LogFactory logFactory = new ScreenLogFactory( true, true, true);
MessageFactory messageFactory = new DefaultMessageFactory();

Initiator initiator = new SocketInitiator(application, messageStoreFactory, settings, logFactory, messageFactory);
initiator.start();