Measure the intended dimensions of the frame of your awning; take into consideration the desired length and slope of your awning.
Cut your lumber into five separate pieces: two beams for the upper support, two beams for the lower support, and one longer beam for the front.
Cut two 45-degree angles into two pieces of lumber with your miter saw. The miter saw has the ability to cut angles. The angles should both be on the same side of beam; these pieces will provide the slope of the awning.
Screw the ends of the long piece to the tops of the two side pieces with two long screws. Place the sloping beams on top of the short beams and screw them together with two screws. Screw metal brackets into both sides of the support beams.
Place the awning frame against a wall and screw the brackets into the wall.
Cut two triangular pieces of plywood for the ends of the awning frame; nail the pieces to the frame by placing nails along the perimeter approximately every 6 inches. Place appropriately sized plywood onto the front of the awning and nail them into place in a similar fashion.