I don't run now but I used to. I did a 5K before doing a 10K just to build up my confidence and b/c it was a pretty fun event. Have you done either a 5K or a 10K before? if not, do the 5 first, then find a 10K to run afterwards. There's always events going on in the running community so check your local running store for races and such. Make sure you get shoes that are right for you. I would go to a running store and have them fit a pair of shoes for you and then you can run around the store to see how the shoes feel. Also, since it's been a long time since you've run, take it slowly 'cuz if you try to run too much too soon you might injure yourself. Check out if there are any running clubs in your area (if you like running with others). I'm more of a loner so i enjoyed my solo runs.
The longest I ran was a half marathon after training for about 10 months. (and then my hips and knees gave out)! But i enjoyed the time i did run and actually remember that "runner's high" a couple times. Good luck, Jamie!