Yes, exactly. By the way, you can use Wikisłownik to find the forms of many words.
Just remember that mianownik = nominative, dopełniacz = genitive, celownik = dative, biernik = accusative, narzędnik = instrumental, miejscownik = locative, wołacz = vocative. Or look for the translation when you forget it, click the case the translation of which you've forgotten, and down there you will find the translations. And here you go. (It's not that scary to use a polish website, give it a try!)