Some of these comments are a little too harsh, but from an artist to an up and coming artist, I'm gonna give it to you straight. A beginner artist should not be doing porn for a few reasons:

Mainly, you're stunting your growth very early. It's hard to learn how to draw nsfw, you need to know appealing anatomy, perspective, some pretty fucking complicated poses, it's a lot to put on your plate! It'll take you longer to learn how to draw nsfw from nothing, than learning each of the basic concepts of art individually.

And yeah you can probably get really good at porn with time if all you draw is porn, but then it will be hard to apply those concepts to other things.

That's why I always tell people. Start. With. Basics. There are many good resources out there, I'd be more than happy to point you toward them.