Anyway, why not just ask here? I’m sure you’ll get an answer.
As far as illegal formation see here. It’s pretty simple actually, the rule just says that you have to have 5 offensive players on the line of scrimmage and at least 5 of those guys have to wear numbers between 50 and 79.
Maybe Wikipedia’s American football strategy page and whichever detailed links you choose to dive into – e.g., the list of formations (long and mostly irrelevant to the modern game, but still has the necessary info)? Everything else that comes to mind is book-length, seeing as they’re books.
Going for a long bomb on first down isn’t extraordinarily rare. It’s usually done when the quarterback spots a hole in the defense. And it is unexpected, otherwise the defense would have closed the hole.
ETA: Another place to get these answers is a bar. You’ll get several different answers, and none of them may be right. But it can be a lot more fun.
There was a rumor that Dan Snyder had this on his desk when he first bought the Redskins. Might not be true, but he may be the only thing that unites people from whole range of the political spectrum in DC.