Lesson number 1: Practice and create block times! Block your time on a weekly basis for creating videos!
Lesson number 2: Train your voice! Speak up and use your voice as a weapon for your videos and podcast!
I learned so much from Roger Love and if you're a speaker or coach you should definitely listen to this session with him:
On-Camera Confidence Tips Your Competition Doesn't Want You To Know; Taught By Celebrity Voice Coach Roger Love
Here is the link: