Ideally put 1 foot in front of the other and run. It sounds simple and it is! Don't worry about the speed just cover the distance. Ideally you should be able to talk comfortably while you do so. Under this programme you run 3 days a week I would suggest Tuesday, Thursday and Sunday with Sunday being the long run day.
You can, of course, schedule the runs for other days but have a non-running between work outs. You will find the local park an ideal place to run. Use the grass if possible. Feel free to walk during your runs at any time if you feel tired or need a break.
Nobody cares whether you run the full 5 mile run - they are more concerned that you finish. If this means walking every step of the way in training and in the run then do it!