I agree with Jason, 100% -- before you dive into the what and the how, it's critical that you understand the why and the who first.

Let's start with the why:
- what's the problem you're trying to solve?
- what are the business and personal goals that you want to fulfill?
- who else is talking about the same subject? What value are you adding to the conversation?

And looking at the who:
- describe the ideal member of your primary audience. How does s/he want to receive your message? Where are they already listening?

Finally, it's important to be honest about your own work style. One of my clients couldn't get jazzed about writing a blog, no matter how much the data said it was the right way to go. So we set him up doing video reviews of his products and he's been super successful because the process isn't daunting for him. Other people I know hate being on camera, so they podcast instead. And many people enjoy the flexibility that written blogs offer, so that works better for them.

I think you'd find a lot of value out of a Skillshare class I put together recently. It addresses most of these topics and more and is priced so it's affordable in any budget. http://skl.sh/1f08fmd

The best advice I can give is pick one thing you enjoy and keep at it. If you'd like, I'd be happy to chat with you for about 15 minutes or so to help you clarify your goals. Here's my free clarity link: https://clarity.fm/andreagoulet/howdy

Best of luck! :)