I am guessing you missed some important steps. The default configuration "standalone-full.xml" does NOT contain the Teiid subsystem. We have another configuration file called "standalone-teiid.xml" that has all required properties to install Teiid and its components. If you want to use your current "myconfig.xml" then you can also add Teiid configuration on top it using the scripts in the "bin/scripts" directory, these are CLI scripts that you can run using the jboss-cli.sh, upon successful completion you will see the Teiid system come alive inside the WildFly. There are installation steps here https://teiid.gitbooks.io/documents/content/admin/Installation_Guide.html
Now your process of deploying the JDBC driver for Oracle looks right, now you said you deployed the VDB fine too. When you deploy the VDB you will see a message like "MYVDB.1" is ACTIVE, that signals that you have successfully deployed a VDB. There are other ways t find out too, but this is simple, quick.
Now, to access to VDB will be just like any other database. You provide the user, password on the connection URL, in your case in SquirreL. By default the port is 31000 of JDBC, 35432 for ODBC. When a VDB is deployed it is also available through ODATA using your web browser. Please JDBC and other connection details here https://teiid.gitbooks.io/documents/content/client-dev/Connecting_to_a_Teiid_Server.html
Teiid documentation is pretty extensive you should be able to find most of the stuff, if do not see something please be sure let us know.
Thanks. Hope this helps
Also, you already defined an admin user, which is needed to access the web console, but (in the simplest case) you need also an application user (use the same tool to create, as you did for admin user, choose the other option)
That is the user/password you need to provide do squirrel and other tools (also odbc and odata, iirc). But there many other authentication options possible
thank you very much for your valuable responses! With your help, I was able to configure Teiid to work as expected.
Keep up the good excellent work!