Are you looking to run for time or distance? If you are going for distance....start of slowly. Try a mile the first two weeks running three or four days a week, then raise it a half mile every other week. Once you get up around three miles try doing a couple of ruck marches (
http://www.armytimes.com/offduty/health/military_muscle_070416w/ ....that will get you in some great shape, we ruck for four miles on the fast day and then six on the slow day(meanwhile running three miles on the other three days of the week!) Make sure you do plenty of stretching before and after! Hope that helps!