I have a couple quick suggestions, depending on the scope of your interest. First, check out Battle Tactics of the Civil War by Paddy Griffith. It is a solid study of the conflict with empahsis on how the rifled-musket affected the linear tactics. Griffith also covers many other tactical considerations, so this should be a good start for you.
If you want a more strategic level study, try Civil War Command and Strategy: The Process of Victory and Defeat by Archer Jones. This title is more geared towards the meta-maneuvers and how these affected specific engagements. Also looks at the maturation process of commanders' operational skills from both armies.
Hope this helps.
Noah