"Tell me what to do."
"Thaw the pumpkin pie, roast the turkey, and pour the cider."
"Tell me what to do in what order."
"First, about three hours before dinner, preheat the oven to 350°F and then put the turkey in. Second, about an hour before dinner, take the frozen pumpkin pie out of the freezer and put it on the counter to thaw. Third, just before everyone sits down, put the glasses on the table and pour the cider."
Often, it doesn't matter what order things are done in. Here, he's just using the phrase "what to do in what order" to suggest very specific, detailed directions.