what "schools" of bass playing are there?

[Thomas Erickson]

You can contact me about the Viennese method, as well as what would probably be called the modern American method. I'm also somewhat familiar with the Rabbath method. I'm obviously not an expert in any of these, but I do have some knowledge of them.

As far as the "confused student" is concerned - if you want to play the double bass, you need to seek out a teacher. He probably won't be close to where you live - this isn't a common pursuit. Most any (classical) method you find will work - it isn't an exact science! These are weird instruments with players to match. Keep in mind that technique is more important (when it comes to instruction) than music - there are lots of great musicians out there who teach, but probably shouldn't. Learn technique from your teacher, learn music from your institution!