So you're an up and coming creator, professional, crafts-person, what have you. In that case, either you offer abundant value to other people or you are in the process of getting there.
To reach an audience and market your skills or wares, you've decided to leverage the internet – the ultimate amplifier. Whatever you do, don't use audio!
Does it have to be at least 500 words? What should be the subject? How much research goes into it? Should it have lots of references like an academic paper?
When I am in the process of convincing myself or someone else about an idea, I begin by compiling my arguments in a note and figuring out what makes most sense.