Yes you are on the right track, but.
Lets assume for the moment that your BBB server is correctly installed. In fact, to make things simpler try suing the BBB server that comes by default and once you have your Moodle plugins configuration correct switch to your own BBB server.
So, lets get back to Moodle/BigBlueButtonBN. I am still not clear on whether BigBlueButtonBN works fine for you or not. So lets go back to point 4.
4) Configuration of these plugins with certain parameters
Please forget recordingsBN, only install BigBlueButtonBN for the moment. And don't change any of the configuration parameters that come by default (no yet).
5) Creation of the meeting directly on the BBB
We'll skip this step because you are going to use test-install
6) Insert on the Moodle course the learning objects BigBlueButtonBN and RecordingsBN
Add a BigBlueButtonBN activity in any of your courses. Again, don't change anything. Use only the parameters by default. It should work fine.
Use the activity, join the session, start the recording, spend some seconds or minutes in the session and end it from the Moodle tab by pressing the end session button.
Wait for a few minutes (15 minutes if needed) and then go back to the activity. Is there something showing up at the bottom of the page, right after the description of the bigbluebuttonbn activity?