The chief clearinghouse for popular renditions of the work of conservative intellectuals is The National Review. They have an extensive online presence, and their articles are suitable for interested high school students.

Some of their pieces will seem a bit extreme for a commited progressive, but they have a unique and unchallenged 50-year reign as the right's semi-official print outlet. William F. Buckley was, for many years the editor of the magazine version. Expect a lot of academic analysis and a collegiate vocabulary.

RealClearPolitics.com is the better of the web aggregators for conservatives, reprinting all major current conservative punditry as well as progressive pieces that informed conservatives need to be familiar with. RealClearPolitics puts a high premium on currency, so they will link to anything that seems really hot in the world of political analysis. They provide lots of links to video clips from politicians and commentators.

If I were doing a class, I would start with these.