The pitcher, batter, and catcher must be in their respective boxes (or in the pitcher's case, toe the rubber) in order for the ball to become live. The catcher must remain in the box until the leaves the pitcher's hand. That's why catchers in college and the major league hold their hand out and have to jump out to where the ball is thrown during an IBB. If not, it's a catcher's balk (same as any other balk).
Catcher's Balk? So the runners advance a base? This is why baseball is such a great sport. Just when you think you have it all figured out, it never ceases to amaze. This is the second rule I've learned this year, and the first two I've learned in over 10. The first was swinging strike three in the dirt, first base occupied, batter can advance if, and only if, there are two outs.
Since when do kids that age actually have to pitch an IBB? I haven't watched anything other than college or MLB since I got out of highschool about 15 years ago... but I don't ever remember having to pitch when we wanted to walk a guy. We just told the ump and put him on.
You need to watch more baseball. Both of these are pretty basic rules if you are a baseball fan at all.