Basic Skill Set for a CFO

I am the Office Manager to a small but growing engineering consultant firm. When I was hired 2 years ago our staff included just the Owner, another engineer, a CAD technician and me. Now we are up to 8 and the Owner has told me he'd like to put me on the track to become CFO. I am excited by the challenge but my background is not at all appropriate. I have a BA in English and that's it. I'm very good with #s but I need some guidance about courses I should be taking to get up to speed, so to speak. To be honest, I want to have another discussion with my boss about how he defines a CFO, because he might be looking for something more resembling a controller, but I imagine preliminary skill sets for either position are similar. Thanks in advance for any feedback.