If your goal of making a podcast is to sell your product or professional service, think twice.

Important to remember:

Podcasts are all about connecting with your audience. If the audience senses that you are trying to sell them something they will most likely lose trust and the connection will be lost. 

Think about how to best SERVE your audience, not how to SELL to them. As a podcast producer, you are creating a community around the subject of the podcast.

If you are a professional (therapist, lawyer, gardener, etc...) and your intention is to share your knowledge and talk about your profession on your podcast, it can definitely help you gain credibility in your professional field.