Want to finsh my basement
How high are the walls. Feet or Meters ?? You did not specify where on Earth you are located.
How Wide is each wall.


Normal Sheet Rock 4' High X 8' Wide 
So you take Ceiling Height (probably 8' ) Divide by my sheet rock height 4' = 2.

Basement room Walls W1 + W2 + W3 + W4 = W_total Width 
Divide W_total Width by 8 the Sheet Rock Width = Total_For_4'_High_Wall.
Total_For_4'_High_Wall * 2 because we want the wall to be all the way to the ceiling. This is equal to total sheet rock required for the Basement.

Studs 16 Inch on Center Divide W_total Width by 16. Since you mentioned Framing - you have a base framing and top framing you will also need to add W_total Width multiply by two and divide by your base and top frame board lengths say 8' for ease but you can buy 10 or 12 foot boards as well. 

EDITED 5-10-2016 to provide an example with the OPS Dimensions.