Well the miniatures, if plastic, were likely to be from the Perry Miniatures ACW range.
If they were metal, then there are many, many companies that make metal figures for the ACW... Perrys, Old Glory, Redoubt, Dixons, Foundry to name but a few.
As for rules... Well I own seven sets of rules for ACW and I can think of another six that I dont have. There could be literally hundreds of ACW wargame rules out there!
Most popular at the moment are Blackpowder by Warlord Games (written by Rick Priestley) with Johnny Reb III, Guns At Gettysburg, Fir & Fury and several others all with their own followers.
I play Blackpowder for ACW and also Guns At Gettysburg when the armies are smaller.
Just working on my Confederate Zouaves to finish off my ACW army... Got the new Perry plastic Zouaves yesterday and they are amazing figures.
One of our ACW games to give you some eye candy...
http://www.guildwargamers.com/phpBB3/viewtopic.php?f=206&t=12538