There's really no WordPress to contact. WordPress is a free open source software made by a company called Automattic. They are not going to talk to you about teaching you.
You have the forum, you have 100 or 200 WordPress related private blogs, videos all over the web you can find on Google.
Look at it this way. If someone on a board who had never made an HTML website before and knew very little about it asked you how do I make my first website, and it has a strict list of requirements, how do you answer that question? Where do you start?
I linked you to an excellent article about how to turn an HTML website into a WordPress theme. You don't need to get rid of your HTML website but you do needa WordPress website that looks like your HTML website. So start there. Make a WordPress site that looks like your HTML site. Then you can use it for the blog part of your HTML site.
You just need to start working on it. Install WordPress on a website, find a simple WordPress theme, and turn it into one that looks like your HTML website.
Here's another good (and old thus partially outdated) tutorial on making WordPress themes
Start working with this stuff!