One day of fast interval training. Think longer sprints. One day of "race pace" running. Normally at a distance a little longer than what you will be testing at. Run day two like you'd be running for whatever test you are looking at. Your test could be for a PD physical, a race, or whatever, but work to stay on the pace you want/need to keep. If you can't keep the pace do it as fast as you can. One day of long distance of at least 2 times the distance of your test. Don't worry about your pace on day three just keep running.
Since you are just starting don't worry if you can't maintain the pace you need, just do your workouts at the best pace you can. If you have to stop to catch your breath on day two then stop running and catch your breath, but don't stop your progress to the finish line. You shouldn't need to stop running on day one, because you are going as fast as you can for a short distance, then taking a bit of a break. If you can't sprint to the end run a little slower, but remember the goal is to be sprinting. I've seen people run the straights on a track, walk the curves, and take a longer break after a lap. The distance can easily be lengthened when your stamina increases. The goal is to sprint the whole track then take a break.
But when a long train of abuses and usurpations, pursuing invariably the same object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new guards for their future security.
Translation for the intellectually challenged: If the government screws the people too much, it is the right and duty of the people to revolt and form a new government.