You're going to make some bad hires, so you need a way to detect and dispose of them very quickly. And, here it is:
Monitor performance (after 1, 3 & 6 months) to identify new hires who are failing.
Use these milestones as opportunities for coaching or cut your losses by releasing the bad hire immediately.
Poor performers can be given a package if they leave voluntarily.
Those who don't leave are watched closely with the understanding that they will be terminated if they don't improve in the next few months.
Find more here