Poloneza czas zacząć!

'The FSO Polonez is a Polish motor vehicle produced from 1978 to 2002. The car's name comes from the Polish dance, polonaise.'

'The polonaise (Polish: polonez) is a slow dance of Polish origin, in 3/4 time. Its name is French for "Polish." Polonaise is a widespread dance in carnival parties. It is always a first dance at a studniówka ("hundred-days"), the Polish equivalent of the senior prom, which is approximately 100 days before exams.'

'Pan Tadeusz [by Adam Mickiewicz] is recognized as the national epic of Poland. It is compulsory reading in Polish schools. A film based on the poem was made in 1999 by Andrzej Wajda.' If you watch this fragment of the film, you will see a polonaise:

Don’t worry if you don’t understand what they say, there is a lot of old-fashioned vocabulary you will never need. You can learn the phrase starting at 0:55 sec. – Poloneza czas zacząć! And at 3:20 begins Inwokacja – the most famous piece from Pan Tadeusz that every child in Poland learns by heart at school. Well, you can try it if you want... ;D

(info copied from Wikipedia)

Słownik - a dictionary

What makes a good Polish dictionary?
Well, it seems that the most important thing for you should be verb endings. To be able to conjugate our verbs you need to know the endings of the 1st and 2nd persons singular. And this is what a good dictionary will offer you. (I wrote about verb endings here)
You will be able to guess the pattern of conjugation of a particular verb and in time you will get the same feeling like a native speaker. But even if your Polish is quite advanced, there are still some irregular verbs that can surprise you as they often surprise Poles themselves!

Most of my students use a Collins Polish dictionary. I posess one too and can certainly recommend it. It gives you the endings. It has a lot more in it. You can read a description here: Literia.pl.
The cheapest way to get a dictionary would probably be Amazon.