If you're decently fit for the half, that could work quite well in terms of a classic periodised middle distance plan.
Your existing fitness should count as the base aerobic phase (i.e. quality long runs, tempo sessions, longer rep interval sessions)
You need 2 or 3 weeks to transition to speed endurance anaerobic training.
Then the remainder do hard anaerobic training, one main fuck you up a bit session (4-5k of short reps at race pace or quicker with long recovery) and a second that's way down in volume but gets the feet moving quickly and varies the pace.
If you're decently fit for the half, that could work quite well in terms of a classic periodised middle distance plan.
Your existing fitness should count as the base aerobic phase (i.e. quality long runs, tempo sessions, longer rep interval sessions)
You need 2 or 3 weeks to transition to speed endurance anaerobic training.
Then the remainder do hard anaerobic training, one main fuck you up a bit session (4-5k of short reps at race pace or quicker with long recovery) and a second that's way down in volume but gets the feet moving quickly and varies the pace.
Look at Jack Daniels for specific suggestions.