Hi, I have 80 feet of 10-3 underground wire and would like need a light and an outlet in my shed that is 40 feet from my 200amp box. What is the simplest way to do this? (My level of experience is that I've run wiring for my Washer, Dryer, stove, microwave and bathroom.) Code wants me to buy a $15 permit and burry the cable 18" deep or 12" deep in conduit.

What breaker do I use in my box?
Must I have a subpanel box in the shed?