Immediately after you finish David Gordons aforementioned online course on Ayn Rand and Objectivism, you can start his online course on Libertarianism and Contemporary Philosophy. (The poster says Libertarianism and Modern Philosophers, but since in academic parlance modernity begins with the Renaissance, and courses on modern political philosophy would generally be expected to focus on folks like Hobbes and Locke, Im going with the title at the top of the courses announcement page rather than the title on the poster.)
The course will deal with the arguments pro and con of inter alia John Rawls, Gerry Cohen, Ronald Dworkin, Thomas Nagel, Robert Nozick, and Jan Narveson as well as, yes, the argumentation ethics of Hans-Hermann Hoppe. (Thats Rawls in the pic, not David, btw.)