After 10 minutes of fitness walking to prepare your muscles for the effort of running, you'll run 5 kilometres without stopping.
Stay in easy breathing mode: you should be able to talk as you run.
If you have a heart rate monitor, you should be roughly in the 70% heart rate zone during the running stages, and never go over 75%.
Finish off the session with 5 minutes of slow walking to warm down and promote recovery.