New to historical gaming - interested in getting started with ACW

[ChrisBBB]

As BBB has had positive mention here and in the other places you've been asking (thanks, chaps), let me point you towards collected reviews of BBB so you can make your own mind up:
https://bloodybigbattles.blogspot.com/2016/10/collected-reviews-of-bbb-bloody-big.html
As others have noted, there are plenty of ACW scenarios in the BBB group files:
https://groups.io/g/bloodybigbattles
Ed Mueller has done good things with BBB at half scale that would fit your limited table requirement:
https://edmwargamemeanderings.blogspot.com/p/bloody-big-battles-resource-page.html

Good luck with finding the ruleset to suit your taste.