Well, what's the most important or the most urgent? Or just start from the top or whichever one you want to start with. For me it was just a few drawer in the kitchen that needed cleaning. It was just a small task but as my boy came back from college yesterday for a week, it needed to be small and in the kitchen. Make sure that if you wrote organize the desk, you don't start emptying all the drawers at once. Remember we're only doing 30min. Do one thing at a time, one drawer, one part of the closet, etc...
Happy organizing!