I've created a list of common カタカナ words, which are also called 外来語(がいらいご). (If you're following my class, you'll soon know all those kanji!) The list is in a wiki format, so anyone can edit them. There's actually two pages, one with English and one without:
http://tonysensei.com/wikis/tony/long-list-katakana-words-japanese-only
http://tonysensei.com/wikis/tony/long-list-katakana-words-english
Most of the words on the "with English" page actually haven't been translated yet, so anyone who would like to jump in and help translate them is welcome to. (ナイススタート、メグさん!) Please do read the instructions at the top of the page first, though!
I also welcome additions to the list, but this is a PG-13 site, so please keep it clean. 


I am begineer, and wannna know that for learning basic japanese language which scripts shoud I take in mind?