Krashed if you look in the legalese section I believe there's a sticky that has the restricted handbook available for downloading. You should read it cover to cover, and it will answer most of your questions.
The single/double action thing confuses a lot of peple, but it's actually very simple. All you have to remember is that the name is talking about what happens when you squeeze the trigger on a pistol.
On a single action: ONE thing will happen only. (the pistol will fire if it's already cocked, but if it isn't already cocked it won't fire).
On a double action: TWO things will occur when you squeeze the trigger. (the pistol will #### itself, AND the pistol will fire if a round is in the firing chamber)
If you live in Calgary I would be happy to show you in person, and you'll understand completely in less than 15 mins.