Layout two long pieces of pressure-treated lumber called "skids." Space floor joists on the skids as directed in the plans and nail them to the bands of the frame. After completing the frame for the floor, use your hammer to nail plywood to the frame.
Layout wall frames on the floor you just completed. Measure and cut studs to plan specifications and attach to the top and bottom plates. Nail horizontal members that run perpendicular to the studs. Attach wall siding and repeat for rest of walls.
Lift the walls into place. Make sure walls are plumb (vertically straight) with the floor before attaching them together. Use nails in the corner studs to attach the walls together. Make sure the walls are flush with the floor and then secure the walls to the floor with nails.
Install beam supports on the front and back walls. Install roof trusses on each support. Install the rest of the roof trusses at 16 inch intervals.
Secure cross members to support the trusses and keep them straight. Apply sheathing to close in the roof. Outside, attach the fascia board at the top of each wall just under the roof. This adds a finishing touch and helps prevent weather damage to the roof and structure. Add doors, windows and hardware as indicated by the plans.
Install tables and storage in your shed. While you could build your own potting table, many home centers sell them inexpensively. A good potting table will have a storage shelf underneath it for pots and soil.
Install pegboard to the walls of your shed with nails or screws. Use hangers in the holes of the pegboard to store tools such as a hoe, a rake and hand tools.
Use a large recipe box to store seed packets and organize by type: annual, perennial, flower, vegetable, fruit. Other plastic containers can be used to organize plant markers, marking pens and plant stakes.