Good luck and enjoy the process. I found using an elliptical first worked well to learn how to breath better. Less bounce and could keep track of my speed and resistance. Then I started C25K.
To get the 5K done I used this Couch to 5K program. (http://www.coolrunni...2_3/index.shtml)
I was getting distracted and not paying attention to the timing then I found this cool little site c25kplaylists.com. The music is OK, but the nice thing is the voice prompts to remind me to walk or run. I can concentrate on form and not look at my watch. I just saved the 30 minute song as an MP3 file and put it on my iPod.
Speaking of form - http://www.jeffgallo...m/learn/videos/ Jeff has some great tips. Most important take away, short stride, shuffle, feet close to ground to prevent injuries. When I last tried to start running, I didn't do this and ended up hurting myself and was not able to walk for nearly a week. I used his tips and it has lead to pain free running.