Clarifications about CPU working: as the functions to get the operands are physically generated?
It seems that you have two texts here, one talking about CPUs in the most clumsy way imaginable, and one sounding like a quite reasonable text book, and you can't get the terms of that clumsy text explained by the text book. 

I suggest you read that text book, and that text book alone, because the other text isn't going to help your understanding at all. Something like "the control unit produces the sequence of pulses on each control signal line required to implement that instruction" sounds like someone with no understanding at all trying to hide behind big words.