Just got off the phone with David Neidert. My biggest question has been whether it's realistic for me to take 15 hours. It seems like quite a lot to me.
I've decided to start with 12. Besides the fact that I haven't been to school in quite a while, this also solves a problem. The logical thing to put off is the Hebrew class. I don't like the idea of putting it off; but since the professor is teaching in Zambia, it seems reasonable to not sign up right away and give myself time to come up with a solution.