If you want to work your way up to running, I recommend the "Couch to 5k" program. It's an exercise program designed for beginners with zero experience:

So basically, on the first day you run for 60 seconds, then walk for 90 seconds. Repeat that cycle 8 times. You can adjust the amount according to your needs but the basic idea is to gradually increase the amount of running and decrease the amount of walking.

There are a lot of free apps and podcasts using this program in which somebody tells you when to run and when to walk. It's easy and fun, I highly recommend it