There is a book called Evolution, Science, and Scripture, edited by Mark Noll (Wheaton College) and David Livingston (Queen's University) that lists some of Warfield's views on this. It is over 300 pages and thus a little hard to totally summarize on such a huge issue. Additionally, I put this book on the back burner about a year ago and have not returned to it, thus I can not fully answer your remaining questions. I can state from what little I read in this book, that Warfield drew what he thought were "reasonable distinctions" among Darwinism, Charles Darwin, and evolution. He accepted the probability of evolution while denying the implications of "full-blown" Darwinism. Additionally, he held to an inerrant view of Scripture.

Reformed and Always Reforming,