Is there an overhead light or is the light on the wall? There are vent fan/light combos that will use the existing overhead light wires. You will have to run a vent tube to the outside with a proper vent exit. The exit will have a flappy door thing that will open outward only.
Edit: changed “bent fan” to vent fan.
Also! Most applications will have a box that is installed in the ceiling for the vent tube to attach to and the fan sits in.