Hi Julie,
In my opinion, basically, 3 lights would allow to get a quick and easy set-up.
Using reflector(s) without an assistant to help you to place it at the right place with the right angle is very time consumming (not only in the space XYZ direction, but also in the 3 axis setting). Saying that, it/they but could give very stunning result. Also for efficient reflector effects you have to use it with soft boxed light(s), ihmo.
Also, the basic for close portraiture efficience apply too. 1 for background, 1 for the Boom, 1 for the model (if possible some refectors would help also to lite the subjet).
As I read, you don't have softboxes yet ? So if I was you, I would invest on one first (36" or higher with removable grid) and AB ring as you have AB monolights. Ihmo, one the most known on 1 light application is butterfly lighting. There a lot more also, for me, the most efficient photographer here in DPreview at this game is M. Eastwood.
Good luck,
Bach.