There is so much stuff out there it is hard to know where to start. Most seminaries will have some courses online the way RTS does. If you'd prefer to listen to sermons from time to time, I think Sermon Audio has a feature where you can search by Bible passage or topic. To be sure though, the site is a mixed bag running the gamut from Covenanter to Independent Fundamental Baptist. But most of the churches have a page on there telling you what they believe.