Overweight and unsure about workouts!

It depends how fast you want to lose the weight. The more you do, the faster you lose. BUT, doing too much too soon can cause injuries or burn-out. A typical beginner's routine is to start with 10 minutes of vigorous exercise like fast walking 6 days a week, or 20 minutes every other day. Then add a minute or 2 per workout until you are at 30 minutes 6 days a week, or 45-60 min. 3 days a week. It's better to do 5-6 days a week if you can.