How much will it cost to drywall my basement (materials + labor)?

I would like to drywall 2 rooms and a stairway in my basement. One room is 15 x 20, the hallway is 5 x 10 and the stairway is surrounded by two walls. How much would the drywall cost to purchase, have installed, and have compound spread in the joints? Also, my basement is currently cinder block with no furring strips. Would the drywaller be able to install these or do I need to?