A good place to start is with our own Jim McGhee's "Guide to Missouri Confederate Units, 1861-1865" University of Arkansas Press, 2008. It is quickly becoming(has become in my opinion) the defacto standard starting place for the questions you ask. (That's a unabashed plug for a very good book by one of the most knowledgable researchers of Missouri confederate civil war history around, and all around nice guy.)

John R.