you do not need to exercise to lose weight at all, a healthy diet and some time will work, but exercise will work faster and ull feel better. if you just want to lose weight do not worry about what you do, just do something. The more cardio the better if you have no weights or little and want todo resistance training, push ups, dips off a couch, sit ups, and a ton other body weight excerises will help you out.
Sorry for the run on sentences and bla bla im tired Oh..and sleep as much as you can ideal is 8+ hours a night. Dont say but i can handle 4...sleep 8 if you can.