Could some one tell me how many pieces of drywall it would take to drywall 908 sq ft

Using 4'x8' sheets (4x8 = 32 sq.ft.), you would need 29 (908/32 = 28.375). However, your space isn't likely to be one big flat wall, so you will need more or less depending on the complexity of the architecture, number of windows, etc. Drywall also comes in different size sheets.

Thank you