What strategy should I use for my run training schedule?

What's the right ratio of endurance, technique and speed/tempo running workouts I should do each week?

There are many different strategies and methods out there. Most of them include some sort of "base" phase, and all include some sort of taper, where you decrease the amount you run leading into your event. What happens in the bulk of the training depends on who you ask, and on what you specifically need to improve to get better. But make sure you are taking recovery in between your hard efforts.