Here's a HUGE list of Japanese words that you should memorize! There's like 800 of them so it'll obviously take a while, but you need to build up a strong vocabulary before you can speak Japanese well, right?
http://www.jlptstudy.com/4/jlpt4_vocab-list.html
http://www.jlptstudy.com/4/jlpt4_vocab-list.html