When I started a couple of months ago I couldn't jog for longer than 1/4 mile at a time. I can now jog a 9 minute mile with no walk breaks.

I started off with similar plans to what people have already posted. I would jog for 1 minute, walk for 30 seconds, jog for 1 minute, walk for 30 seconds. With my stride and pace this resulted in a mile time of anywhere from 12 minutes to 14 minutes......depending on how fast my walk was in between. Slowly I added in more and more jogging until one day I decided I had to "push" myself and quit giving up so early, and that was the first ever in my life I had ran a mile straight without stopping.