This is where you should start and I'll tell you why...
I'm a city boy, having been born in Brooklyn, NY and living in the city or suburban NJ until I was 18. When I left NJ I had only touched a gun a couple of times and I had never fired one.
My first time touching a gun was very nearly my last. I was in elementary school at the time. My best friend knew where his father kept a very nice revolver. One day, while we were playing "Army Games - Cold War edition" (a game we hastily created when we were bored and tired of "Cops & Robbers" and "Cowboys & Indians"), my friend said" Do you want to see a real gun?" What happened next is very predictable. We snuck into the master bedroom and pulled a step stool out of the closet. Within seconds, I was holding a beautiful presentation box, the contents of which held what I now know to be a 357 Magnum. A partial box of ammo was there too. My friend told me to grab it and point it like we'd seen in so many cowboy movies. Pointing it right at my friend's chest, my finger resting softly on the trigger, I was amazed by the size and weight of the gun. Suddenly, we heard someone coming up the stairs. In a panic, my friend grabbed the gun and got everything up on the shelf just before the bedroom door opened. Needing a good excuse we told him that our sisters were playing "hide & seek". We were told that the bedroom was off limits so we ran out to play in the yard. A few days later I found out that the gun was loaded. Had my friend's father not come upstairs at the right moment, I completely believe that I would have shot my friend at point blank range.
I started teaching my kids about firearms safety when they were two years old. I believe that the Eddie Eagle program should be mandatory for all children. It will save lives, possibly the life of someone you know.