A few things to add. You mention that you are overweight. Me too, so a few things to keep in mind. First, shoes will likely not last as long as they would for smaller runners. Be prepared. Everyone has said it, but I can't overemphasize the importance of good shoes. Second, be very careful not to overdo it. As a woman with excess weight, you are at greater risk of injury, especially things like stress fractures. Having done that a few times myself, you don't want to go there, LOL. The best thing is be sure to rest enough and don't increase speed or mileage too quickly. Jeff Galloway's plans are very good for injury prevention. Finally, and this is really important, don't diet too much. You are never going to do well learning to run if you are trying to survive on 1200 calories a day or something crazy. If you are going to run, you are probably going to lose weight more slowly, but you will be so much healthier.
I started running (for real) in June. I was over 250 pounds and my first jog I thought I would die at 30 seconds. My muscles screamed and I didn't think this would ever be possible. I got a hip fracture in October (most of which was pushing too hard, especially for my body). I'm about to run Princess Glass Slipper and have lost some weight. (That wasn't a goal when I started running.) Only about 25 pounds, which is <1 pound/week, but I am so much healthier and feel like a new woman!
Keep asking questions. This is such a great, supportive group of people here.