Most importantly: Have fun with it. The chances are you won’t have any huge sponsors in the early stages of a podcast, so use those opening episodes to fine-tune your process and overall sound. Having professional, clean sounding audio will make the difference between listeners taking you seriously and not.
I’m not here to tell you to “fake it ‘til you make it.” The person that coined that divine piece of wisdom has probably never experienced the daunting 10 seconds before walking out onto a stage and singing in front of hundreds of people. I am, however, here to tell you that getting a grip on anxieties and insecurities around your vocal performance is perfectly possible.