The word "Shed" must be a little bit elaborated in order to understand the size of the metal building that you are talking about. In essence, you will have the following sequence:
I. Substructure
Site Survey
Exvacation
Isolated Footing;
Shuttering,
Reinforcement,
Anchor Bolts Placement
Casting,
Insulation,
Instulation Protection
Fill around footings
Vapor Barried placement or Blinding
Reinforcement
Casting of Slab on Grade
II. Superstructure Erection
Columns and Rafters
Purlins, Girts and Sag Rods
Wire Mesh and Insulation
Cladding
Cranes if any
Windows and Doors
Trims and Accessories
Gutters and Downspouts
Mastic and Foams
Fire Protection, Paint and specific requirement might be needed.
III. Electromechanical
Cable Trays and wiring
Fire Fighting system
Fire Alarm System
There are over 15 E/M system and depending on the design that you have, you can include them.
IV. Finishing
you will need an office area, storage, electrical room, and toilers, this is usually made of Block. The sequence is straight forward.
If you have any other question, or you need more detail information, please let us know.