Convert the 50A/240V receptacle in the garage to a sub panel. Then run one 30A/240V for a baseboard heater, one 20A/120V for a fridge and chest freezer and one 15A/120V for outlets and lighting; all through conduit to a shed just next to the garage. All of this is in very rough planning, but does the concept and numbers sound even remotely in the ballpark of feasibility?