Yes the bus is the way to go.
There is a fifteen minute walk from the airport (walk to the main road, turn left, continue to a turning on the right ((cut through the car park)), walk up to the mini round about 200m and turn left). Walk up a gentle slope to the main roundabout / road and turn and the bus station is about 200m on the left.
About 4 Euros for the bus which gives a wonderful journey through NE Corfu including the olive groves and villages.
Depending where you are staying the driver may stop and let you off...