CoffeeCup,
I agree with E-Learner that you should be able to handle this book. Your English is VERY good! And if you run into troubles... I have an idea. If you recall, Olya had a thread dedicated to a movie she was watching where she posted question just about that movie. ... you could always start a thread just about this book and post questions and we can help you out.
I have never read this book or the short story. I do recall hearing about the musical as it won awards and was popular when I was in school. I'm certain I can get a copy of the full version either online or at our library if you plan on reading the full version (Throbert has already found the short version online for us) and would be willing to try and help you out with any questions.
So... let's get this summer reading underway.. between Dorian Grey and Flowers... we have a nice book selection this summer!