I finally took the plunge and bought ACW2 and have been having a lot of fun. I love the depth that it offers and although there are a few things I'd like to see added (sortable leaders, etc.) most of them are covered elsewhere on the forum. I've read through the manual, played the tutorials, and managed to win a couple of the smaller campaigns. Loads of fun. I recently started up an April 1861 Confederate Grand Campaign and, whew, talking about dropping into the deep end!
I started off by moving Beuregard's command onto Fort Sumter, which I think was a mistake, since I got an event that it had surrendered... but it remained in Union hands until I stormed it. I also began recruiting troops to serve as the eventual core of my armies only to find that they (Army of the Potomac, Army of the Shenandoah, Price's Command, etc.) were simply appearing. Beauregard teleported to Manassas to command the Army of the Potomac. While, particularly in the South, I was expecting to see garrisons and militias started up by the govenors, it was kind of a suprise to see entire armies created by events... will this continue throughout the war?
I decided, once they were unlocked, to move the Army of the Shenandoah to Harper's Ferry, which was quite an experience. Due, I assume, to the lack of command points early in the war, the men suffered heavily en route. The Stonewall Brigade, for example, was down to half strength and had never been in combat! This led me to look into the replacement system, which I'm still figuring out. Particularly the amount of brigades to have as reserves in order to cover the required hits.. which I think is the red numbers on top. Long story short, the Union Army of the Potomac attacked the Army of the Shenandoah in Harper's Ferry, leaving the way to Washington open for the Beauregard's Army of the Potomac, and that's where I left off. I think I'll restart with the lessons I've learned so far, but I have a few questions for you grognards

1) Are armies and garrisons automatically recruited and does that continue throughout the war?
2) Is a brigade worth of replacements the equivalent of 10 "hits"?
3) Until Divisions and Corps are unlocked is it the best idea to make a bunch of small stacks in order to get around the command penalty?
4) Completely unrelated to the above, is it possible for the Union to recruit US Regulars at some point or are you stuck with what you begin with?
Oh and a final interesting note. I noticed that there was an enemy army roving around north-eastern Virginia. I popped out to see who it was... and it was a stack made up of nothing but Union generals. Bold move!