Way to go, Richard! And welcome from someone who probably should have been an engineer but wound up being a psychologist. Go figure.
As you may already have discovered, there's not just a ton, but several tons of information on the website -- much of which are in long-inactive forums, which of course don't show up in the View New Content feed. Be patient with the Search feature. Browse the archived forums in the Fridge, at the bottom of the Forums page. Feel free to ask questions.
And I have one: What did you make that your sons liked so much?