It's VERY important to learn grammar with new words! How you will understand the grammar without knowing any words?

When you repeat from your memory, you can only say what you have heard. It might work if you study Japanese for very limited purpose such as traveling. With grammar (and new words, of course!), you can make your own sentences.

Yes, it is important to learn grammar , and as a beginner you need to know three things ( Japanese Letters + common phrases + Grammar ) 1- this is one of the best website ^_^ to learn Japanese Letters + common phrases http://smart.fm/goals/search?keyword=japanese+phrases http://www.realkana.com/hiragana/ http://www.realkana.com/katakana/ 2- learn some common Japanese Phrases : http://www.japaneselifestyle.com.au/japanese_language/japanese_phrase_basic.htm http://www.linguanaut.com/english_japanese.htm http://japanese.about.com/library/blsjp.htm 3- Japanese Grammar http://thejapanesepage.com/grammar.htm