This will give you an estimate of how many sheets you will need. Draw the sheet layout on your sketch to reduce cutting and to place the joints in inconspicuous areas. Horizontal application is preferred by most installers, because it reduces joints and increases strength. 60 lbs. or 5 gal. Special metal outside and inside corner beads are available to improve the strength of corners.
Drywall goes by many names, including gypsum wallboard, plasterboard and sheetrock.
By any name, drywall is gypsum plaster sandwiched between heavy sheets of paper. Drywall also comes in a variety of thickness' to match your application. You'll find gypsum drywall with square, tapered or beveled edges. The tapered and beveled edges let you fill and tape quickly and easily, for invisible seams. If your work is not square, a quality drywall job will be very difficult.