Polish Pronuciation for Non-English Natives

I am a Czech so Polish is relatively close to my native language(Czech language). But Polish has some sounds I can't pronounce(I don't know what to do with my lips and tongue). For example how to pronounce 'rz' or nasal 'ą'. And I can't find any good book on Polish pronunciation. So how can I learn proper Polish pronunciation? Thanks a lot for your effort to help me...

the best person to answer the question will be Magdalena whos polish and czech and speaks both languages

did you try google?

Try this A Concise Polish Grammar It might help you.

freekarol, this might help you too. There are many youtube videos like this.

Ivona.com - the best!

Thanks Piorun for the PDF. It is really helpful... :-D

To Ender: of course I did use Google. It is the first thing I do before asking a question. And I found out there are not much textbooks on Polish language and almost nothing helpful about polish pronunciation...

To Eurola: thanks for that video I will try to find more.

To SzwedwPolsce: it is helpful but for people who can hear differences between polish sounds. For example the difference between ś and sz. For me it is almost the same...