Olie, the best way to get good at reading is to do a little bit every day. Get a Real Book and read chord changes and the melodies (it's a good thing to read treble clef) and then get some random books for bass, cello, trombone, violin, sousaphone, whatever and just put some notes in front of you. I think the class is a good idea, but it won't substitute for just doing a little bit every day. Get together with friends and read tunes a group. It's a lot of fun!
Another thing to practice is the Simandl method for upright bass. It starts out nice and basic and gets crazy pretty quick. Then, get a drum book to read rhythms. It really helps to read stuff not written for the bass.
Anyway, that's my 02c.
Edwin