Lol. First off go read the "I'm a beginner" thread in the beginners section.
Yes it's possible.
If you're going to bother to take them don't skip doses. They will help if you have everything dialed in correctly.
Don't put too much stock in those electro-impedance bodyfat scales. They aren't very accurate. Of course in your case they are fine to track progress.
That is highly individual. BF% is typically assumed to be overall %, so for some having a lower bodyfat in their arms is possible long before the rest of them catch up. I've seen guys at 30% BF with visible veins in their arms, but their gut sticks out far enough they can't see their feet. There are no hard or fast numbers.