BB, my sweet! Ah yes, First Causes ... one of my favorite topics.
A "First Cause" is, by definition, an un-caused cause. This is a major problem, at least for me. The whole idea behind our search for causes is our firm, experience-based understanding that things have causes. Yet here we have the concept of a "first cause" -- a thing unlike all other things -- a thing with no cause whatsoever. This contradicts all of our experience and everything we know about cause-and-effect. So for me, the entire business of First Causes belongs in the realm of theology. By saying that I mean to say it's one of the things I guess I'll never understand.