There is a bunch of good information available on this campaign to be had. Here are a few of the items that I am looking at:
War Diaries: The 1861 Kanawha Valley Campaigns - This one is in my wish list at the moment. I hope to pick it up over Thanksgiving.
Battle of Scary Creek: Military Operations in the Kanawha Valley, April-July 1861 - This book should prove interesting. It too is in my wish list.
Robert E. Lee and the 35th Star - I own this one. I found it in a second hand book store while working on The Coming Thunder. It is not bad and gives a decent overview of the campaign.
The Glories of War: Small Battle and Early Heroes of 1861 - This is one of my favorite books on the actions in Virginia in 1861. Very easy to read and packed with details that any scenario writer needs. This proved invaluable for The Coming Thunder. He takes great care in walking through the little things that lead to bigger actions. This is definitely on a must read list if you have any interest in the early war period.
I have also managed to find some unit histories as well as the memoirs of one of the Union Generals - Jacob Cox. I should have plenty to read over the week of Thanksgiving.