A copy of the property plat showing the location of the shed. Call out the distance from other buildings and the property line.
Something showing the design of the shed. If the shed is a commercial product, a copy of the product brochure is sufficient. If the shed will be constructed, a drawing of the shed is necessary.
The city will have the application reviewed by several departments. If everything goes well, someone will contact you and tell you to proceed. If there is a problem with the plan, someone will contact you with alternatives. Either way, there is no fee for this review.