How can I learn to read music?

....For free....I used to be able to do it very accurately but I stopped playing the clarinet in 6th grade then I lost it. My parents bought me another one last year, And I'm having a difficult time learning how to read the musical notes, and remembering how to play the clarinet. I figured I would start back up with this as a hobby, to get my mind off of writing. Writing is my passion, and I'm writing a story, but I seem to be in a stump right now. The story is starting to feel like a chore. So I would like to get my mind on some other things right now. I have a sewing machine and things to sew with and I have a clarinet that needs playing. Two perfectly good hobbies right there so the search is over. I'm going to start with the music, as music is my second passion =/ . So if anyone could please provide help as to how I can re-learn the musical notes, and re-learn how to play the clarinet I would honestly be in debt to you, I've been wanting to...re-learn...how to play for some time now but things have been extremely hectic lately, now that my parents are gone for a little while, I figure I have some time to myself to learn this better. Thanks in advance to all of those who provide help (: