Be sure to listen to your body! Don’t push yourself too hard from the start but build up to it slowly. Start with 1 mile or whatever you feel comfortable with mixing in running and walking and then just build up from there. Be sure to stretch and drink TONS of water! And running on sand or grass is much better on your joints 🙂 Signing up for a 5K or a 10K for a few months down the line is always a good motivator to keep on running as well!
Also, Map My Run is a really fun site if you want to start charting your routes or seeing your mileage!