You state..."I thought the latest thinking/code was to not have an earth ground on the sub pannel" BUTTTTTTTTT each structure served by an electrical service still requires grounding so Id still establish a grounding electrode system at the shop be it "made" like driving rod or rods into the earth or approved metallic piping or foundation steel etc etc.
You state..."All sub pannels have to have a seperate ground that runs back to the main pannel and its earth ground. This keeps everything on the same ground plane so you don't get a shock"
THATS RIGHT a sub panel has a seperate and isolated (from Neutral) equipment ground buss and its wired back to the equipment ground buss back at the main panel. It just so happens that at the main service entrance (there and not at subs downstream) the Neutral buss is bonded to the equipment ground buss and the Neutral is also bonded to a grounding electrode (driven rod or rods etc)
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