If you're becoming a talent manager with an extra push, because you already have years of experience in this field, then go "made in the shadows," as it's called.
What you need to do is find someone who has done all of this before, who is willing to teach you everything you need to know, and then you will have a lot of knowledge on what to do and what not to do, like everything why and how. But where do we find such people?
There weren't millions of them, but they weren't completely lacking either. Many have been preoccupied with such matters for most of their lives choosing, after successful careers, to mentor those of us who hope to become talent managers. You can also look at early talent development programs online.
You have to look for such people if you want to benefit from years of experience in this field while you don't have it yourself.
If you want to become a talent manager and take advantage of years of wisdom in this field, the best and easiest way to find these potential mentors seems to be to search online via the internet.
There are clearly some who offer their mentoring services in this area and bring with them an invaluable wealth of knowledge and wisdom that can only be gained from experience.