Not that much. It would help a little, but really not that much because you would still not understand AS very much.
False, It would not help with Flash but it would help with AS since you already know programming basics like if else statements loops, recursion and all those other fun things it would be alot easier to learn than starting from scratch.
It's a nice introduction to basic concepts, such as conditionals, variables, loops, and all that other good, fundamental stuff. While it may not be helpful in terms of object oriented programming, it's probably the best approach to coding in general.