Superb ASL Resource Link:
https://www.desperationmorale.com/
I know, it is like Groundhog Day, or a scratched record (again and again). Yes, I am going in again. Wish me luck or pass me the bottle of Jack Daniels, and yes I mix it with coke and ice. The ASL Starter Kit #1 is my way in (again). I have also ordered ASL Starter Kit #2 as well, because "you do need indirect fire" in WWII infantry combat. I was also looking (too much looking) at ASL Starter Kit #3, which brings in tanks, but the prices were/are just too crazy. ASL, sigh, like an attractive mysterious woman, perplexing. It seems so right until you start dating! It is not that the "sound of" the rules doesn't feel right - even "good" (when [or rather if] you managed to cram them all into your head), but it is that there seems so much to learn and options (edge cases) to remember, so you are left with the feeling of "have I missed something"! Which - is frustrating, but in the end for ASL - is that a bad thing, if it gets you there?
Footnote: I have a theory. A lot of the ASL rules seem to stem from misuse of Squad Leader rules or dissatisfaction with unintended game effects. In the same way that the follow on versions of DBA (or its more complex cousins DBM, DBMM etc) were aimed at stopping "competition gamers" distorting the historical principle of the game, winning in "unhistorical" ways. Trying to maintain the historical realism and avoiding clever mathematical twists that inevitably snag rules.
Please see Bob Corderey's Blog Home Page (Wargaming Miscellany) - The First Rule and The Spirit of the Game on https://wargamingmiscellany.blogspot.com/ - top right hand side! I also want to run ASL with miniatures, 1:1 (they are company sized battles). Does that make me "mad and bad"? Because otherwise you forget what you are trying to model in the real world. I have a friend who invested heavily in 2mm blocks of troops and literally said it makes you stop trying to "wibble" when you realise the number of men you are trying to control!
Update I: Found this interesting blog/website as it describes ASL SK#1 - Simple Equation Scenario 3 was thinking of transferring to the tabletop (spoiler alert the attack was bounced and ran out of turns):
https://www.stallardhonour.com/a-journey-into-advanced-squad-leader/
Update II: Board Game Geek tutorial support (thanks to "John Y", see comments):
https://boardgamegeek.com/thread/157922/an-aslsk-tutorial-part-1
The Internet is a rabbit hole of ASL resources!