Feel free to use an online dictionary to look up German words. I suggest Dict.cc
To supplement your learning in class, feel free to use any of these free, online services (You may need to register, and Herr Donovan cannot be held responsible for their contents, so ask your parents first!):
DO NOT USE GOOGLE TRANSLATE, or similar translation service. It's basically like asking someone else to do the work for you, and then you don't learn what you're supposed to.
GERMAN AMERICAN PARTNERSHIP PROGRAM (GAPP)