This training plan will give you specific workouts based on RPE
The RPE scale is used to measure the intensity of your exercise. you don't have to use a heart rate monitor, but must follow the RPE training plan and not work harder.
Easy (1-3): Could talk normally, breathing naturally, felt very comfortable
Moderate (4-6): Could talk in short spurts, breathing more labored, within your comfort zone but working
Hard (7-9): Could barely talk, breathing heavily.
Max effort (10): At your physical limitations or past it, gasping for breath.

The plan is for novice athlete that aims to finish the half marathon and improve former races.

The first month is designed to establish a good aerobic base so be patient and don't run at a harder pace than the plan.

Monday workout is various interval workouts.
Wednesday workout is a tempo workout that will gradually assimilate the pace for the race.
Saturday is the long run that is needed for building aerobic endurance.

I have added strength workouts on Tuesday and stretch workouts on Sunday. I suggest not to skip these workouts as they will keep your body safe from injury

stay committed and the results will come.