I have downloaded an app on my phone to aid with building up from 5km to 10km. 3 runs per week with each individual run having the following structure:
Week 1: 4x 10 mins of running with 1 minute of walking between each run.
Week 2: 3x 15 mins of running with 1 minute of walking between each run.
Week 3: 3x 17 mins of running with 1 minute of walking between each.
Week 4: 3 x 18 mins of running with 1 minute of walking between each.
Week 5: 2x 22 mins of running with 1 min of walking in between.
Week 6: 1x 60 mins of running.