What is the best way to get started in this dive?

First to get started with WordPress, you should learn what it is used for before you actually install and set it up. You could read some guides about it or watch tutorials on YouTube and get the preliminaries out of the way before you start to actually create web pages. Also, be sure to register on WordPress.com.  All of this is free to get started.
Often, people want to build an amazing WordPress website on day one, and as fun as that seems, it's not going to help you in the long run. Slow and steady, starting with the basics--that's the way to go. So, it's now time to put together a solid study plan and schedule, using the many resources we have assembled for you on the pages to come.
Take the tutorials and get to know WordPress. Create your first web page. When you feel ready, move on to the intermediate tutorials and advanced tutorials.

Learning any new technology can be frustrating at times.  That's why it's so important to have a community to help you with your learning journey!  So, if you haven't yet, we heartily recommend you join our worldwide Break Diving community on this website(breakdiving.io). There, you will find others willing to help and guide you along your journey on WordPress. Plus, you may also find others also pursuing the Coder – WordPress dive just like you!

So, to get started, your first steps should be... to join Break Diving. Then, start learning!