There are certain basics that need to be ticked off when it comes to being a professional speaker.
In his book "The Magic of Speech Evaluation" Mr. Andrii Sedniev lays out the basics of what makes a great speaker:
- Toastmaster Skills
Each one of these 4 Kings/areas are worth for 25% each leading up to a grand total of 100%.
The first 3 are all present in the world's top paid professional speakers, many of whom are not Toastmasters. This clearly explains why many people who have no formal training in professional speaking are able to be so successful!
But however if you want to exceed the 75% bar then you will definately need to get the extra training. My recommendation is that you join a Toastmasters club and go through at least the basic "Competent Communicator" programme. I am a member of Seagulls Toastmasters, which is based in Windhoek, Namibia.
As an aspiring professional speaker you need to master each of these kings, the most important of which is "Authenticity".