If you have joint issues, you might want to save jogging until you've lost a bit more weight. Have you considered walking for 30 minutes instead? Ultimately, you want to do 60 minutes of exercise most days. But, please don't let that stop you from doing whatever you can right now. Just taking that first step is a huge accomplishment.
Also, be sure and add strength training into your workout routine. You want to develop some muscle while you're losing weight. It really helps to shape and tone your body.