Situation: I am running 400 amp service onto my property/campsite/future home site. I set up the meter base and a 200 amp breaker on a pedestal(2 4x6's with a board wall) I have a grounding rod attached to the meter base as per the schematic from the electric companies engineer. I am running an underground wire (Approximately 25 feet) to a small shed off of a 60 amp breaker in my 200 amp main breaker. I bought a 100 amp breaker box value pack because it was cheaper than the sub panels that I looked at. I installed a grounding busbar onto the 100 amp breaker box (Screwed into the box itself) and when I wired the shed all of the grounds are running to it. The grounds and neutrals aren't currently connected in the shed.
Questions:How do I ground the 100 amp breaker box? The grounds are not bonded to the neutrals, but I am unsure if I am supposed to add another grounding rod (Some of the other campsites I've looked at don't have a grounding rod for small buildings.), connect the grounding busbar to the ground on the 6-3 UF wire I was going to use to run underground to the 200 amp main breaker, or do I do both?
Location: Indiana