I've run a half marathon.
To train for it, your main run should be a long one every weekend. start out doing 3-5 miles, then every week up it by a mile until you get up to 14. Don't worry about pace for this run, just do it to get the distance in.
In addition to the long run, do at least two other runs per week at 3-5 miles each.. these are the runs where you work on your speed.
Then do a couple of slow casual jogs 1-2 times a week, so ultimately you are running around 5 times a week on average.
Take the day AFTER your weekly long run off to recover.