What should I expect from a swing dancing lesson and how should I prepare?

So my eternally beautiful and infinitely spontaneous best friend asked me to go to a swing dancing lesson with her tomorrow. We had talked about doing it before and I have always wanted to learn, but I’m nervous.

Issues:

-I am stiff, uncoordinated, and awkward.

-I have zero rhythm (when I’m not holding a guitar or drunk) and I have no dancing experience. I make most club-dwelling white people look like good dancers.

-I don’t know what I should wear… especially in regards to shoes.

Help, please, my lovelies?