So, if I understand you correctly, Gil, there is no shallow end of the BaB pool - you have to jump in the deep end and sink or swim.
No, I'm not exactly saying that. But most of the elements of the game don't really lend themselves to a tutorial, as I noted for fatigue and supply. When the game came out there were a few players who, like yourself, were calling for an interactive tutorial, but we explained the various reasons why BAB does not have one. I don't recall all of the reasons, but the two that stand out in my mind are that such a tutorial, especially for this engine, would be an enormous amount of programming work (coming at the expense of improvements to the game), and only a minority of players might need it. There are different types of players and different playing styles, and not everyone prefers to learn in the way you suggest. We believe that the combination of the introductory scenario, complemented by being able to watch someone play online (either the Twitch game Erik Rutins played, or one of the YouTube reviews (links to which are in a thread up above) should be enough to get one able to play the game within an hour, even without reading through the whole manual.
The bottom line is that if we believed that BAB cannot be learned without an interactive, step-by-step tutorial we would have done one, despite the significant investment of time that would take, but this does not appear to be the case.
And again, I'd urge you to share any questions you might have about anything that's not clear.