I enjoy reading screenplays as much as I enjoy reading novels.
Me, too. A well written screenplay is a pleasure to read.
I took plenty of writing classes, seminars and workshops when I was younger. Some were useful, some a snore. It depends on the quality of the teacher and the other writers.
And I took a screenwriting workshop as well - after I had read screenplays and decided it was something I would like to try. I'm not opposed to taking classes. I think anything a writer wants to do is fine. We don't all have the same level of interest or need.
I think the best way to start is by reading. That is why I tell fiction writers to read novels. And it is why I tell potential screenwriters to read screenplays. In my opinion, there's no better way to begin.