The going rate for painting walls and doing the wood work too per square foot

Too hard to answer. How high up? How intricate is trim? Make yourself happy and bid comfortably.

Why too broad, we need to know so much more like sq/ft, number of coats, type of paint, surface condition, number of doors, windows and is there trim top and bottom. Since you are asking we must assume you have not been a professional painter so your rates should reflect and great price. I'd ballpark it at $0.75 sq/ft for the whole show, you will learn from this experience if this will keep you in the black.