Sears Kenmore washer wont agitate or spin with cycle selected?

I picked up a Sears Kenmore washer from the side of the road praying that it would work, but when plugged in I hear a motor running (or some similar electrical noise) but as I tested the cycles on the knob the interior did not move at all. I would like to fix it because I cannot afford another - I am just a single working mom who needs to wash her young kids clothes (preferrably not by hand) - can you help?