Cut two 2-by-4-inch wood studs to a length of 72 inches each with your circular saw. Cut six more 2-by-4-inch studs to a length of 45 inches with your circular saw.
Lay the 72-inch studs in a parallel position about 45 inches apart. Lay the 45-inch studs across the gap and nail them into the longer studs starting at one end and spacing each one by 16 inches as you go. The last two studs should be separated by only 4 inches.
Using your circular saw, cut a piece of 3/4-inch-thick weather-treated plywood to fit your assembled frame.
The Walls Roof
Cut two 2-by-4 wooden studs to a length of 6 feet and leave two more at their full 8-foot length. Cut one end on each of the 8-foot studs at an 18-degree angle using your miter box and hand saw. Place the two 6-foot studs parallel to one another on the ground. Nail your four 8-foot studs to them starting at one end and spacing them by 18 inches. Nail the back wall frame to the top of your already assembled floor frame.
Cut two 2-by-4-inch studs to a length of 41 inches with your circular saw. Cut three 2-by-4-inch studs to a length of 81 1/4 inches with your circular saw. Nail the longer beams to the shorter using the shorter beams as the top and bottom frame for the rest. Place one stud at each end of the shorter beams and one at the center of the remaining space. Repeat this process a second time to create the other wall. Nail the walls onto the top of the existing floor frame so that the side and rear wall fit snugly and are level.
Cut two 2-by-4-inch wooden studs to the width of the front and back of the already assembled shed walls. Cut two more 2-by-4-inch studs to fit the top of the side walls from front to back. Nail these studs into place atop the assembled frame.
Cut four 2-by-4-inch studs to a length of 50 9/16 inches. Use you miter box and hand saw to cut both ends of these studs at an angle of 72 degrees with the angle jutting outward on one end and inward on the other. Cut the outward jutting end at a depth of 3 5/16 inches. Place the angled stud onto the back and front wall frame to measure it for a tight fit. Nail the roof support studs in place.
Cut 3/4-inch-thick weather-treated plywood to fit the back and side walls of the shed using your circular saw. Nail the plywood into place to serve as your walls.
Measure and cut a piece of 3/4-inch weather-treated plywood to fit the roof space using your circular saw. Nail it into place. Use roofing felt and tiles to cover and insulate the roof to your shed.
Hammer, nails, eye goggles, 2 x 4 lumber, circular saw, marker, straight-edge, tape measure, miter box, hand saw, roofing felt, shingles.
Always wear safety goggles and work gloves when working with potentially dangerous tools like a hammer and nails or saw.