I also started from the very beginning just a few years ago, but I chose understanding the history of astronomy first, then moving into modern times in regards to our solar system. The University of Tennessee Dept. Physics & Astronomy was the one I chose, all of it was free.
This was the place I started. Some of the links may be outdated however. I liked the way it was structured, so I spent many a night shift reading and researching. Enjoy!