You can become a talent manager if you have years of experience in your field. You'll be starting from scratch and all on your own, but it's possible to still benefit from the experience of others, and it's not difficult.
You need to find someone who has done it before and who is willing and able to share their knowledge. Then you will have a wealth of information sources for all things related to what to do and what not to do. You can also look for leadership development webinars online by navigating this website.
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Basically, talent managers make calls to people on their contact list, and then prepare and post ads on different recruitment sites. They review the applications and select those who they like to forward to production managers and series producers for interviews.
They are not all the same, but there isn't a shortage of them. Many people who have worked in this field for a long time have decided after their success to mentor those who want to be talent managers.
If you are looking for a way to gain the benefit of many years of experience in this field, these people are the ones you should seek out.
You can search the internet for potential mentors if you are looking to become a talent manager. You can find mentors who offer their services and have a wealth of experience.