It sounds like you know a thing or two about working hard.
With a little bit of patience, dedication, and support (from all of us here at Website Babble), you'll overcome the learning curve, and you're going to do great.
I think Foong's idea is a great one, but I would start with more than just one subject or topic... come up with 3 to 5 ideas.
You mentioned your children are working on their own online businesses... what do they do? If they work on websites at all, you should invite them here, and I am sure they will be impressed with their father!
Welcome to Website Babble.
Sherif