As a person whose lost a few pounds over the week from over eating..
I suggest you start out with power walking on a treadmill and set yourself a goal.
Then gradually move up to jogging for 10 minutes. Then maybe next time 20 minutes and so on. You'll build stamina and you'll be cutting down on the body fat. When you're comfortable with that start using weights and toning yourself. Before you know it, you'll be more comfortable with the body you're in and I'll bet you'll feel very accomplished.