If you're not sure where to start (besides putting one foot in front of the other) try these:
Couch to 5k is a great program for never-ran-before runners.
If you are ready to start half marathon or full marathon training, Hal Higdon Training Programs are excellent. I feel like Hal holds my hand and patiently explains every significant detail of training.
If you don't know what to do with your diet, there are lots of ways to keep track of what you are eating. If you have a fancy smart phone, search "calorie counter" in your market place or app store.
I use Spark People when I want to track how much I'm eating or see if something I am about to eat (or drink) is worth it. There are many out there that work just as well. I used The Daily Plate on my computer for a long time too.
Determination is more important than any training or diet program to me. If you have that, you can snatch up all the other things you need to become a runner without a problem. I'm no expert on the human brain, but here are my scrawlings about capturing and keeping determination: